City Cooks Up New Compost Recipes

  • A pile of food waste awaits processing at a Duluth, Minnesota composting site. A wide variety of materials arrive each day - anything from unused frozen dinners to sheet rock to bird droppings from a nearby zoo. Photo by Stephanie Hemphill.

Lots of people have a compost pile in the backyard. They throw their grass clippings and kitchen scraps in a pile and let it sit. Eventually it turns into rich black stuff that can be spread on the garden. Many cities around the Great Lakes collect residents’ yard waste and turn it into compost on a bigger scale. In Duluth, Minnesota, they’ve taken it a step further. An industrial-sized compost operation uses some surprising ingredients. The Great Lakes Radio Consortium’s Stephanie Hemphill reports:

Transcript

Lots of people have a compost pile in the back yard. They throw their grass clippings and
kitchen scraps in a pile and let it sit. Eventually it turns into rich black stuff that can be spread
on the garden. Many cities around the Great Lakes collect residents’ yard waste and turn it into
compost on a bigger scale. In Duluth Minnesota, they’ve taken it a step further. An industrial-
sized compost operation uses some surprising ingredients. The Great Lakes Radio Consortium’s
Stephanie Hemphill reports:

There’s a steady stream of cars and pickups as people drop off leaves and branches. They’re
piling up their yard waste at the compost site of the Western Lake Superior Sanitary District in
Duluth, Minnesota. The Sanitary District takes care of the trash for Duluth and nearby towns.

At the back, four rows of future compost are cooking in the sun. They’re about 6 feet tall and
half a block long. They were mixed by a master chef of compost, Charlie Hitchcock. He’s about
to cook up a new batch. Today’s mix starts with biodegradable bags of kitchen scraps from
several restaurants.

“It’s a small load today, but it’s food waste and there’s animal hair that’s thrown in from some of
the pet grooming places. A lot of protein and nitrogen in that, I guess.”

Hitchcock consults a laptop computer to create his recipe. He plugs in the weight of the food
waste. The computer program tells him the right proportions of wood chips and leaves to mix in.
It’s aiming for the ideal combination of carbon and nitrogen. Most loads are about half wood
chips.

“Because it aerates it pretty good. And then I just keep punching a number in on the leaves until
I get between a 25-to-1 to a 35-to-1 on a C-N-N ratio, carbon to nitrogen.”

(tractor starts)

The key ingredient that’s loaded in Hitchcock’s mixture is different every day. That’s because the
sanitary district is always trying to divert stuff that would normally go to the landfill. Lately
they’ve been going after some of the garbage itself, not just yard waste. And sometimes that
garbage comes from some exotic places.

(bird sounds from zoo)

Dave Homstad takes care of the birds at the Lake Superior Zoo. He’s giving the parrots some
fresh water.

(parrot chit-chat)

He slides out the bottom of the cage and whisks sawdust and bird droppings into a black plastic
bag.

“The composting stuff goes into a black bag, so that we can keep them separate. And then
anything that can be composted goes in here and then eventually into a dumpster for that
purpose.”

The dumpster gets filled with uneaten food, animal bedding, like straw and sawdust, and animal
dung. At the composting site, the dumpster-load from the zoo might be mixed with scraps from a
coffee shop. A commercial fishing operation brings fish guts. Even sheetrock is ground up to
become compost. The latest addition is waste grain from the elevators on Duluth’s lakefront.

(train sound at elevator)

The Cargill elevator handles 50 million bushels of grain every year.

Roger Juhl manages the operation. He says there’s some spillage when railroad cars have to be
changed from one type of grain to another.

“So we have to clean them out and dump them onto the tracks, and then pick them up and put
them in the dumpster. And that’s where they’ll go to this recycling center.”

Juhl says he’ll probably save some money. He’ll still have to pay the hauler to take the grain
away, but he won’t have to pay for dumping it in the landfill. What’s even better, Juhl says he’ll
be doing something good for the environment.

“Hopefully it’ll be useful for something.”

It’s put to use, all right, in Charlie Hitchcock’s compost mixer.

(compost sound back up)

The mixer’s been turning for 15 or 20 minutes. Hitchcock peers into the barrel. The ingredients
look like chunky dirt, and smell like day-old garbage. He reaches in for a handful.

“I do the squeeze test on it. If you get it packed tight without moisture coming from it, it’s within
the 50% range, which is good.”

Hitchcock is learning how to turn an amazing variety of stuff into compost. Some days he gets a
load of spoiled vegetables from a grocery store. Other times it’ll be outdated frozen dinners.

“When I get a lot of wet pasta, I use some sheetrock and mostly grindings. That’s shredded up
tree branches and limbs that we have. I don’t put leaves in it because the pasta’s so wet, it gets
real gumbo-y.”

After six months in a pile, the compost is ready for customers, like Suzanna Didier.

“I mean, I’m glad they’ve figured out a way for us to decrease the amount of garbage that goes
into the stream, into the waste stream, because obviously that needs to be slowed down a bit. So,
it’s great.”

It’s an expensive operation that doesn’t pay for itself. Officials hope to recoup half their costs by
selling compost. As they get more raw materials, it’ll become more cost effective. Someday,
they hope everyone in Duluth will send their kitchen waste for composting.

For the Great Lakes Radio Consortium, I’m Stephanie Hemphill.

Taking Bite Out of Canine Confrontations

Humans have been living with dogs for some 12,000 years, using them for hunting, protection, and friendship. Yet as both human and dog populations have grown, so too have the problems between the species. Great Lakes Radio Consortium commentator Julia King has discovered that with warmer temperatures, the furless and the furry often find themselves nose to snout in public places:

Transcript

Humans have been living with dogs for some 12,000 years, using them for hunting, protection,
and friendship. Yet as both human and dog populations have grown, so too have the problems
between the species. Great Lakes Radio Consortium commentator, Julia King, has discovered
that with warmer temperatures, the furless and the furry often find themselves nose to snout in
public places:


Fifty-three million dogs live in the United States – more per capita than in any other country in
the world. One out of every three households here includes a canine companion.


Despite the fact that they drink out of toilets and roll in a wide range of things unspeakable, we let
them sit on our sofas, give us big slobbery kisses and ride in the front seats of our cars.


We like to think of our dogs as our better halves. And sometimes they are, with their wagging
bodies and their penchant for forgiveness. And because they forgive us our trespasses, we’re
inclined to do the same for them.


“Oh, don’t you worry,” said a gray-haired lady in the park recently. “My Rover wouldn’t hurt a
flea!” Meanwhile, her dog snarled at my left thigh. Eventually Rover grew bored of tormenting
me and I jogged (ever-so-gingerly) into the sunset unharmed.


But each year some four and a half million other Americans aren’t so lucky; that’s how many dog
bites are estimated annually in the U.S, according to canine aggression experts. Nearly 335,000
victims are admitted to emergency rooms each year. The insurance industry estimates more than
a billion dollars in dog-related liability claims annually.


Despite all the chew toys and rawhides we shower on them, dogs bite us. Not because they’re
bad, but because they’re dogs. They don’t know any of the good swear words. They can’t pound
their fists on the kitchen table, or throw plates when they’re really mad; instead, they have sharp
teeth.


We should love our dogs. But loving them doesn’t mean expecting them to be human; it means
acknowledging that they’re not.


As the weather warms up so, too, does the likelihood that humans and dogs will “mix it up” out
on sunny sidewalks and in public parks. That means those of us with dogs have some added
responsibilities.


Yes, yes… we know… Fido is a perfect dear, wouldn’t harm an ant. Just the same, please do us
all a favor and keep him on a leash.


(Bark!) Hey, ( Bark! Bark! Bark!) get back here!


Host tag: Julia King lives with a man, a kid, and a dog in Goshen, Indiana. She comes to us by
way of the Great Lakes Radio Consortium.

Activist Family Sets Stage for Global Warming

Scientists predict global warming could have a devastating impact on the earth and its inhabitants. But a traveling theater troupe has managed to find something funny about climate change. As the Great Lakes Radio Consortium’s Chris Lehman reports, the group “Human Nature” hopes to spread a message as well:

Transcript

Scientists predict global warming could have a devastating
impact on the earth and its inhabitants. But a traveling theater
troupe has managed to find something funny about climate
change. As The Great Lakes Radio Consortium’s Chris Lehman
reports, the group “Human Nature” hopes to spread a message as
well:


Joyful Simpson’s middle name is Raven. So perhaps it’s only
fitting that she plays a raven in the play, “What’s Funny About
Climate Change?”


“I suppose the raven in mythology is known as a trickster or a
shape shifter. So she’s come in human form to both tease and
cajole and plead with the audience for their understanding and
their awareness.”


(sound of play: “You came, you actually came! I said that if we made a show about global warming sound like
it actually might be funny, that the humans would come. And
here you are…suckers!!”) (laughs)


(fade under)


“What’s Funny About Climate Change” is a three-person
comedy review. The three members are the Simpson family.
They call their theater group “Human Nature”. Their goal is to
raise awareness about the problems caused by global warming.


Jane Lapiner is Joyful’s mother. She says their group uses
theater as a political tool.


“With comedy and theater in general, people can be more
receptive to important ideas, as opposed to a meeting or a
conference.”


That’s why the Simpsons founded the Human Nature theater
group more than 20 years ago. Global warming’s not the only
thing they’ve written about. They’ve performed plays about the
timber industry, wolves, and Pacific salmon.


David Simpson writes most of the material. He says he tries to
inform people and make them laugh.


“I have to say this is an intelligent show…It’s a sophisticated
show, the humor is sophisticated. People are going to learn
something about climate change, they’re gonna laugh, and
they’re gonna think.”


(sound of play, actors singing)


Joyful Simpson says she was fairly involved with her parents’
theater group growing up. But when she left for college, she
started to pursue other ways to communicate her concerns about
the environment. Her journey eventually led her back to her
parents’ theater group.


The current tour is the first time she’s worked with her parents in
about seven years. She says her years away from her family
might have prepared her for her role in “What’s Funny About
Climate Change.”


“I’m not educated about it from a scientific perspective and
actually I think that I embody some of the societal doubt of
whether or not it is a real thing and I’m trying to break out of
that because I think that’s deeply ingrained.”


Joyful is young. She’s in her mid-20’s. And she says it’s crucial
that young people understand environmental issues.


“I have a lot of people in the older generation that I look up to
who are very active in the environmental and the political world
and I see some of that energy in my generation but we are
lacking in that field. And so I’m pushing myself to feel inspired
to take the torch and also trying to push others to understand our
responsibility.”


(more sound of play: Joyful Simpson: “Did you actually think
there was something funny about climate change? It’s the
biggest disaster in the history of the entire civilization and it
really is happening…”)


(fade under)


The Simpson family will be performing on college campuses
across the nation this spring.


For the Great Lakes Radio Consortium, I’m Chris Lehman.

Dancers Mimic Nature’s Form

  • Dancer Anna Beard performing in Dragontree Waterfall Tea at the Matthaei Botanical Gardens in Ann Arbor, Michigan. Photo by Beth Wielinski.

The arts have long been used to draw people’s attention to things… a woman’s mysterious smile, social injustice, or details in the world around us. As the Great Lakes Radio Consortium’s Tamar Charney reports…one choreographer is using dance to encourage people to become more aware of nature:

Transcript

The arts have long been used to draw people’s attention to things – a woman’s mysterious smile,
social injustice, or details in the world around us. As the Great Lakes Radio
Consortium’s Tamar Charney reports…one choreographer is using dance to
encourage people to become more aware of nature:


(water trickle)


It’s really cold and gray outside. But the tropical conservatory at the Matthaei Botanical Gardens in
Ann Arbor is green and lush. The air is thick with humidity, warmth, and sweet-scented pollen.
The horticulturalists are sweeping up dead leaves, replacing plants, and removing wilted
blossoms. But occasionally the workers lift their heads from what they’re doing to take in an unusual
sight.


There’s a group of dancers, ranging in age from 7 to 70, rehearsing a performance among the
garden’s plants, waterfalls and walkways.


(sound of rehearsal)


They lean against vine-covered walls, prance down paths, and splash water from a fish pond.
Occasionally a dancer’s arm brushes against a branch setting the leaves of a bamboo, papyrus, or
orchid plant in motion. Shirley Axon is an environmental activist and one of the dancers. She
says it’s quite an experience dancing in a lush conservatory instead of a barren stage.


“It’s thrilling…the humidity, the green, the shapes of the plants…
the light, and then to think that we can climb the trees and the walls.”


The dance piece is called Dragontree Waterfall Tea and its creator is Jessica Fogel, a professor
of Dance at the University of Michigan. After choreographing a dance piece for a celebration at
an arboretum over the summer, she realized she just couldn’t imagine going back inside.


“At first I was going to do a snow dance, and then that seemed very unrealistic.”


Eventually she decided an indoor conservatory would be more practical and more comfortable for
both the dancers and the audience. She created this piece by absorbing the shapes, colors, smells,
and stories behind the plants in the garden. Movements the dancers make often mirror the
curves of a plant’s leaves. The dancers also use gesture, props, and pantomime to call attention to
how we use a plant.


“That the papyrus plants can become scrolls upon which messages are written, and that tea comes from these
camellia bushes and can be drunk, and that coffee does come from these beans and chocolate from the trees. So we do play with
those ideas as well, the function of the plants.”


Fogel says we often forget that we depend on plants and
nature for food, medicine, and even paper.
And she hopes this performance will remind people of
our reliance on the natural world. But some parts of the
dance just play with nature.


At one point in the performance, dancer Anna Beard climbs over a wall and down into a waterfall
in the conservatory.


“I step into it and bit by bit I work myself into the water until finally I’m completely immersed in the waterfall.”


She says it’s supposed to be a bit surreal and a bit surprising. She dances soaking wet with the
waterfall splattering down on her body.


“It’s more about existing with the setting and interacting with it instead of just placing some
movement in front of it as a backdrop.”


And unlike a performance in a theater, changes in the garden can affect what the dancers do or
don’t do. During rehearsals, a branch a dancer was supposed to lean against died and was cut off,
another plant grew to be in the way of a dancer’s arm, and some ground cover the dancers were
told they could walk on turned into a path of slippery mud.


Dancer Raphael Griffin says as she performs in the conservatory, she has to be very cautious of
the impact her movements make. The rock ledges are uneven and the plants fragile. And she
says that sense of the dancers treading lightly on the environment is something she hopes the
audience picks up on.


“Just a better awareness of nature and how the human body can interact with nature and yet not
ruin it either.”


Most of us will never get a chance to frolic in a conservatory like Raphael Griffin and the other
dancers in Dragontree Waterfall Tea , but as one dancer pointed out there’s nothing stopping us
from going out into our own backyards to enjoy and appreciate the line, movement, and form in
the natural world around us.


For the Great Lakes Radio Consortium, I’m Tamar Charney.

GAUGING MANKIND’S ECOLOGICAL FOOTPRINT

In the wake of the World Summit on Sustainable Development in Johannesburg, South Africa, there’s been a lot of talk about how to balance human needs with the health of the planet. Ecologists have been trying to measure the impact of humans on the environment for a number of years, with some sobering results. The Great Lakes Radio Consortium’s Daniel Grossman went to the New York Botanical Garden recently to gauge mankind’s ecological footprint:

Transcript

In the wake of the World Summit on Sustainable Development in Johannesburg, South
Africa, there’s been a lot of talk about how to balance human needs with the health of the
planet. Ecologists have been trying to measure the impact of humans on the environment
for a number of years, with some sobering results. The Great Lake Radio Consortium’s Daniel Grossman went to the New
York Botanical Garden recently to gauge mankind’s ecological footprint.


[Rain forest sounds, misters, tinkling of water, rain falling on leaves]


To get a good sense of the impact humans are having on earth, you could travel for weeks
on intercontinental plane flights, river boats and desert jeeps. Or, as Columbia University
biologist, Stuart Pimm suggested, visit a botanical garden. There, under the glass and
ironwork of a conservatory, Pimm says you can see a resource that humans are
over-using – Earth’s most important resource, its plant-life.


“We’re sitting in the rain forest here at the New York Botanical Society. And it’s a riot of
green.”


Professor Pimm says here beneath the misters in the Tropical Rain Forest Gallery is a
good place to start a whirlwind tour of Earth’s greenery. The air is heavy with moisture
and sweet-smelling.


“Rain forests are some of the most productive parts of the planet. They grow extremely
quickly and they are therefore generating a lot of biological production.”


What Pimm calls biological production most of us know as plant growth. Biologists say
all this green growth in tropical forests and elsewhere on Earth is the foundation upon
which all life rests.


“Everything in our lives is dependent upon biological productivity – everything that we
eat, everything that our domestic animals eat.”


And everything that every other animal eats as well. In a recent book, Pimm painstakingly
tallies up how much biological productivity we use. He starts with the rain forest. In the
last 50 years, loggers and settlers have cut down 3 million square miles of lush tropical
forests. Much was cut down for subsistence agriculture, a purpose Pimm says it serves
poorly.


“Although the tropical forest looks rich and productive, it is a very special place. And
when you chop that forest down the areas that replace it often become very, very much
less productive.”


[Sound of walking around conservatory]


Pimm speaks of the toll on greenery of cities and roads and of land converted to farming
in temperate regions such as the U.S. Midwest. Then, trekking along the botanical
garden’s gravel paths, he leaves behind the tropical mists and steps into the dry heat of a
Southwestern desert. Deserts and other dry lands are not very productive, but they
account for a substantial fraction of Earth’s land surface. Most of it is grazed by flocks of
sheep, goats, camels and cattle, often causing severe damage to vegetation. When these
uses are added to the other impacts of humanity on earth’s bounty, the results are
surprisingly large.


“What silence has shown is that we are taking 2/5ths of the biological production on land,
a third from the oceans. And that of the world’s fresh water supply, we’re taking half.”


[Fade out sound of conservatory. Fade up sound of Texas frogs.]


[Sound of plane engines]


Frogs and toads croak out a spring mating ritual in a concrete drainage ditch. Nearby, a
pilot practices maneuvers in a small plane occasionally drowning out the amphibian
serenade. Living in culverts, sharing the night with droning engines, these wild animals
are never completely free of human influences. From his Stanford University office,
Professor Peter Vitousek says wherever you look, the din of human activities is
interrupting and crowding out other species. Vitousek made one of the first attempts to
tally the impact of people on plant productivity in 1985.


[Frogs fade out in time for Vitousek’s act]


“The message to me was that we are already having a huge impact on all the other species
because of our use of the production of Earth and the land surface of Earth. That’s not
something that our models predict for some time in the future or something that we’re
guessing at on the basis of fairly weak information. It’s something that we’re clearly
doing now. That’s already happening.”


Many ecologists say this conclusion is beyond doubt. What they can’t say is whether
human domination of so much of nature’s output is good or bad. University of Minnesota
Professor David Tilman says as a member of the human race himself, he appreciates the
comforts in clothing, shelter and food our lifestyles buy us. And he acknowledges that the
survival of our own species is probably not imperiled – at least for the moment – by the
destruction of others. Still, he wonders if someday we’ll regret today’s resource intensive
practices.


“I think the more relevant question to me is, ‘Are we doing this wisely?’ ‘Are we wisely
appropriating the resources of the world?’ So, my concern is that we live in a balanced
way – a way that is sustainable through generations – that we leave our children and
grandchildren the same kind of world that we have.”


An expert on the impacts of agriculture, Tilman says we’re using up more resources than
can be replaced. He says if we don’t grapple with these important issues now, by the time
the human population reaches eight to ten billion or so people later this century, it might
be too difficult for us to do enough to save the planet’s life as we know it today.


For the Great Lakes Radio Consortium, I’m Daniel Grossman.

Herbicides May Complicate Pregnancies

A Midwest researcher has found that the combination of chemicals in some common weed killers may complicate pregnancies. The Great Lakes Radio Consortium’s Chuck Quirmbach reports:

Transcript

A Midwest researcher has found that the combination of chemicals in
some common weed killers may threaten human fetuses. The Great Lakes
Radio Consortium’s Chuck Quirmbach reports:


Warren Porter is an environmental toxicologist at the University of
Wisconsin – Madison. He says he went to the hardware store and bought
common herbicides containing the chemical compounds 2-4-d, dicamba, and
mecoprop. Porter diluted the mixture with water and fed it many times
to hundreds of lab mice. Porter says the mice experienced a 20 percent
increase in failed pregnancies and he contends exposure to the
combination of chemicals is to blame. He says government regulators
often test only individual chemicals and don’t realize how chemical
mixes might affect a living cell.


“It’s like a molecular bull in a china shop. It’s almost impossible to
predict in advance all the possible things they might do.”


Porter says exposure to the mix of weed killer chemicals can also
threaten human pregnancies. But other researchers say the risk to most
people is very low.


For the Great Lakes Radio Consortium, I’m Chuck Quirmbach in Milwaukee.

Curbing Nitrogen Pollution

Across the country, forests, streams and coastlines are getting extra doses of nutrients containing the element nitrogen. Researchers say the long-term impact of these unwanted compounds on the environment could be serious. The Great Lakes Radio Consortium’s Daniel Grossman reports on some efforts to reduce nitrogen pollution:

Transcript

Across the country, forests, streams and coastlines are getting extra doses of nutrients
containing the element nitrogen. Researchers say the long-term impact of these unwanted compounds on the environment could be serious. The Great Lakes Radio Consortium’s Daniel Grossman reports on some efforts to reduce nitrogen pollution:


A thunderstorm soaks the land and lights the sky. The electric jolts of the lightning change nitrogen in the air into compounds needed for plants to grow. Lightning, as well as microbes in the soil, converts annually nearly 100 million tons of atmospheric nitrogen into plant nutrients. Humans make the same compounds in factories and call them fertilizer, a mainstay of agriculture. Between these synthetic chemicals and a smaller quantity of related compounds produced when fossil fuels are burned, humans produce more nitrogen-rich nutrients than nature makes on the seven continents. University of Minnesota ecologist David Tilman says such extra nutrients are a concern.


“Right now half or more of the nitrogen we put on a farm field just washes through the soil and down into the groundwater into lakes, rivers, streams and into the ocean.”


This wasted nitrogen often travels great distances causing widespread damage. Tilman says on land, the nutrients cause exotic weeds to outgrow native plants. In the ocean, the nutrients cripple critical habitats. The ecologist says nitrogen pollution must be cut. One place to start is on the farm.


“We have to find some way to grow crops where the crops take up much more of the nutrients that we apply.”


(Sound of walking through grass. Quiet bird calls in background.)


Near Chesapeake Bay, farmer and agricultural scientist Russ Brinsfield walks across a patch of tall dry grass.


We’re on the edge of a field, about a sixty-acre field of corn, on the beautiful Eastern Shore of Maryland.


This field is a research plot at the Maryland Center for Agro-Ecology. Here Brinsfield is studying agriculture’s environmental impact. Chesapeake Bay’s waters have high concentrations of farmer’s nutrients, causing blooms of the toxic algae Pfiesteria. The pollution has also caused declines in sea grass beds. Brinsfield says solutions to the problem fall into two categories.


“The first series of practices are those practices that we’ve been able to demonstrate that by a farmer implementing them he can reduce his inputs without affecting his outputs… that at the end of the year have added profit to his bottom line.”


For instance, testing the soil’s nitrogen level before fertilizing. And splitting fertilizer applications into two doses rather than one so that nutrients are added only when plants need them. Such simple measures are good for environment and the bottom line. Brinsfield says in the last 10 years most farmers on the Eastern Shore of Maryland have cut fertilizer use this way. Then there’s the other category of improvements.


“We’re going to have to do some things-ask some farmers to do some things-that may cost them more to do than what they are going to get in return from that investment.”


For example, in the winter, many fields here are fallow and bare. That means top soil erodes when it rains, taking with it residual fertilizer. It wasn’t always this way.


“I can remember my dad saying to me, ‘every field has to be green going into the winter, Son.’ So all of our fields were planted with rye or wheat or barley. It served two purposes. First, the animals grazed it. And second, it held the soil intact.”


And intact soil retains its fertilizer. Such winter cover crops also prevent fertilizer loss by storing nutrients in plant leaves and stalks. This used to be dairy country and cover crops grazed by cows made economic sense. Now farmers mostly grow grains. Planting a cover crop could cut nitrogen flow from farms by 40 percent but it costs farmers about $20/acre and provides no economic benefit to them. Brinsfield says farmers need an incentive.


“For the most part, farmers are willing to participate and to do those things that need to be done, as long as they can still squeak out a living.”


To help them squeak out a living, the state pays some farmers to sow cover crops. The state also pays them to plant buffers of grass and trees that suck up nutrients before they leave the farm. Today farms in six states that are part of the Chesapeake’s huge watershed contribute about 54 million pounds of nitrogen to the bay. The goal is to cut this figure approximately in half by two thousand and ten. Robert Howarth, a marine biologist and expert on nitrogen pollution at Cornell University, says though ambitious, this target can be achieved.


“I think most of the problems from nitrogen pollution have relatively straightforward technical fixes. So the real trick is to get the political will to institute these.”


Howarth says much of the nitrogen problem could be eliminated with a blend of government subsidies and regulations. But more will be needed as well… solutions of a more personal nature.


(sound of Redbones Barbeque)


There’s a pungent, smoky aroma in the air at Redbones Barbeque in Somerville, Massachusetts. The crowded bistro serves up a variety of ribs, chicken, sausage and other meats, dripping with savory sauces. University of Minnesota ecologist David Tilman says when someone eats a meal they are responsible for the little share of fertilizer a farmer somewhere had to apply to grow a crop. If the meal is from farm-raised animals, like the heaping plates of meat served here, the amount of fertilizer is much greater than if it’s from plants.


“It takes from three to ten kilograms of grain to produce a single kilogram of meat.”


Tilman says if Americans ate less meat, they could dramatically reduce fertilizer usage. However, per capita consumption is rising. Meat consumption is on the rise globally as well. David Tilman would like that to change. He says if current trends continue, human production of nitrogen nutrients will grow to triple or quadruple what nature makes on all Earth’s lands. Professor Tilman says that in many places the impact on the environment would be catastrophic.


For the Great Lakes Radio Consortium, this is Daniel Grossman.

Peter Raven-Are We Facing a Mass Extinction?

  • Peter Raven is the director of the Missouri Botanical Garden. More than that, Raven is a world-leader in the effort to classify, understand, and use plants in a sustainable fashion.

Recently Time Magazine labeled Peter Raven one of the "Heroes of the Planet"
for his work in understanding plants and the environment. Raven is the
director of the Missouri Botanical Garden. In the first installment of a
three-part interview at the botanical garden, the Great Lakes Radio
Consortium’s Lester Graham talked with Peter Raven about his conclusion that
we’re facing a mass extinction of species: