Weather Modification Making It Rain

  • The cloud seeding generator sprays heated silver iodide into the air-which then acts like a magnet, attaching to ice particles until snow forms.(Photo courtesy of Christina Aanestad)

We need a lot of water. We use it to grow food, wash our cars and even make electricity at hydro-dams. But in some areas there might not be enough water. The federal government estimates places in 36 states might experience drought conditions by 2013.

So, scientists and power companies are looking at manipulating the weather to create more water. And, as Christina Aanestad reports the practice, called weather modification, is more common than you might think:

Transcript

We need a lot of water. We use it to grow food, wash our cars and even make electricity at hydro-dams. But in some areas there might not be enough water. The federal government estimates places in 36 states might experience drought conditions by 2013.

So, scientists and power companies are looking at manipulating the weather to create more water. And, as Christina Aanestad reports the practice, called weather modification, is more common than you might think.

“A mile and a half to go–we should see the cloud seeder.”

I’m traveling through the rugged terrain of Burney Falls, in northern California with Paul Moreno. He’s a spokesperson for Pacific Gas and Electric, one of the nation’s largest power companies and it wants to modify the weather in this remote area- it’s a process called cloud seeding.

“There it is……”

Energy companies, water districts and the federal government have conducted weather modification since the 1950’s. Today, it occurs in about a dozen states in the US-mostly the West and Midwest.

Moreno points to a large metal box.

“were’ looking at a cloud seeding generator that is off the ground about 12 feet on a steel platform and inside the cabinet is a tank that contains the silver iodide solution. The silver iodide solution is sprayed kind of atomized, like a perfume atomizer.”

This is how it works: the generator sprays heated silver iodide into the air-which then acts like a magnet, attaching to ice particles until snow forms. The purpose? More snow means more water and, more water means more power for Pacific Gas and Electric’s hydropower project.

At least… that’s the theory.

“It’s never been proven to actually work.”

Matt Ryan is a 25-year weather consultant.

“The idea that you can drug the sky into dropping more rain onto you is part of the problem in and of itself. Silver iodide which is the drug of choice throughout the cloud-seeding industry is a class-C toxic non-soluble inorganic chemical. When they say that it is Class C-You can’t flush this down the drain…it’s toxic.”

But not everyone thinks it’s a serious threat. Brant Foote heads the Research Applications Lab at the National Center for Atmospheric Research, in Colorado. He’s studied cloud seeding for decades.

“In general what we’ve shown is that health hazards of cloud seeding is negligible.”

But, Foote seems less certain about whether cloud seeding actually works.

“It’s been a tough nut to crack. There have been a lot of attempts to evaluate cloud seeding and more often than not with inclusive results, rather than with either negative or positive.”

Whether it works or not is beside the point to some. They just don’t like the idea. Mark Franco is headman for the Winnemum Wintu Tribe in Northern California. He doesn’t think people should be playing around with nature. He says instead of trying to artificially make precipitation, maybe we should be putting more effort into conserving water.

“One of the things people forget: when you’re running out of water, don’t use as much. Use water efficiently, people need take responsibility for the usage and waste of water.”

But, despite concerns about whether cloud seeding is a good idea… or whether it even works… some states support the science with millions of taxpayer dollars. And, utilities like Pacific Gas and Electric spend millions of ratepayer dollars on cloud seeding projects in the US.

For The Environment Report, I’m Christina Aanestad.

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Deodorant Maker Fouls the Air

  • Volatile organic compounds (VOCs) come out of our vehicle tailpipes, out of smokestacks, and they’re in a lot of every day products. (Photo courtesy of NinaHale CC-2.0)

The makers of a popular deodorant body spray have been fined more than a million dollars for polluting the air in California. Julie Grant reports it’s part of an increased effort to reduce air pollution.

Transcript

The makers of a popular deodorant body spray have been fined more than a million dollars for polluting the air in California. Julie Grant reports it’s part of an increased effort to reduce air pollution.

The makers of Axe body spray – popular among teenage boys – have been fined for causing environmental problems in California. Dimitri Stanich is spokesman for the California Air Resouces Board. He says California has specific low limits on how much air pollution can come from consumer products.

And if they get a tip that a product is over the limit – they head to the pharmacy.

“THE AIR RESOURCES BOARD HAS ENFORCEMENT OFFICERS THAT WILL BUY PRODUCTS OFF THE SHELF AND THEN TAKE IT BACK TO THE LAB IN SACRAMENTO. TECHNICIANS THEN WILL PIERCE THE CANISTER AND DETERMINE THE AMOUNT OF VOCS IN THERE.”

VOCs – that’s short for volatile organic compounds. VOCs come out of our vehicle tailpipes, out of smokestacks. And they’re in a lot of every day products: some aerosol sprays, most paints, even some cosmetics. Stanich says there are lots of reasons a manufacturer might use a volatile organic compound. In a product like Axe, he says the VOCs make it spray better.

“MOST OF OFTEN IT IS PART OF THE PROPELLENT USED TO FORCE THE PRODUCT OUT OF THE CANISTER AND INTO THE PRACTICAL PURPOSE THAT THE CONSUMER IS USING IT.”

And once those VOCs hit the air – from deodorants, tailpipes and smokestacks – they mix with the heat of the sun – and create ground level ozone. Pollution.

The multinational corporation, Unilever, owns the Axe brand. Stanich says that between 2006 and 2008, Unilever’s parent company, Conopco, sold more than 2.8 million units of Axe spray that failed to meet California’s clean air standards.

The state has fined Conopco 1.3 million dollars.

It’s all kind of a bummer. At least for some teenage girls.

Katie Schombeck and Julia Rombach say the boys locker room reeks of Axe. And they love it.

“YOU SMELL IT AND YOU’RE LIKE DRAWN TO IT, IT SMELLS SO GOOD.”

“I DO THAT ALL THE TIME. I REMEMBER HANGING OUT WITH GUYS, AND LIKE IF THEY SMELL GOOD I’LL BE LIKE ‘HEY COME HERE FOR A MINUTE’ AND SMELL THEIR SHOULDER AND BE LIKE ‘YOU SMELL GOOD.’”

“I’LL GIVE THEM A BIG HUG, JUST BECAUSE THEY SMELL GOOD.”

But these 16 years olds didn’t realize body spray could be bad for air quality.

“BUT IT NEVER REALLY DAWNED ON ME THAT AXE…I DON’T KNOW, YOU DON’T REALLY THINK ABOUT THAT.”

Compared to all those cars and trucks and smokestacks – it doesn’t seem like a little deodorant spray could cause that much of a problem. But Dimitri Stanich with the California Air Resources Board says all those little bits add up.

“WE SPRAY A LITTLE PERFUME HERE, WE SPRAY A LITTLE DEODORANT THERE, SOME WD-40 ON THE VEHICLES WE’RE WORKING ON. THE LIST GOES ON. EVERYTHING THAT’S A CONSUMER PRODUCT HAS THE POTENTIAL TO CONTRIBUTE TO OZONE.”

Stanich says on peak ozone days, people have a harder time breathing, especially those with asthma.

California has a particularly bad ozone problem in its cities – and also has tougher clean air rules than most of the country.

The U.S. Environmental Protection Agency is about to tighten federal air quality standards – to reduce ozone pollution everywhere else.

Julian Marshall is professor of environmental engineering at the University of Minnesota.
He says most health officials support tougher air standards.

But there are lots of ways to reduce exposure in your own home:

“BUYING LIMITED QUANTITIES OF PRODUCTS THAT EMIT VOCS, OR BUYING LOW VOC PRODUCTS. WHEN YOU GO TO BUY PAINTS FOR EXAMPLE THERE ARE LOW VOC PAINTS.”

To reduce exposure, Marshall says get rid of old chemicals and those you don’t need.

In the meantime, California officials say Unilever has corrected the problems with Axe – and reduced the emissions from its spray can. Making a lot of teenage boys – and some of their girl – friends happy.

For The Environment Report, I’m Julie Grant.

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Wind Energy Sweeping Away Wildlife?

  • A single wind turbine can change air currents, creating dangerous winds for birds and other airborne wildlife. (Photo by Michael Tyas)

Wind energy is one of the fastest growing sources of new electricity in the United States. For some environmentalists, that’s
good news. Wind turbines don’t spew smoke into the air. There’s no nuclear by-product. But there is an environmental risk. To see it, you have to view the wind turbines through the eyes of a bird.
The GLRC’s Dustin Dwyer has more:

Transcript

Wind energy is one of the fastest growing sources of new electricity in the United States.
For some environmentalists, that’s good news. Wind turbines don’t spew smoke into the
air. There’s no nuclear byproduct. But there is an environmental risk. To see it, you
have to view the wind turbines through the eyes of a bird. The GLRC’s Dustin Dwyer
has more:


Chandler Robbins has spent a lot of time studying how birds kill themselves. He says he
would go out on windy nights to the Washington Monument in Washington, D.C. He’d
stand at the bottom of the 555 foot tall obelisk and watch the birds at the top:


“Just as they get to the tower, they just go around the edge of it and bang, the turbulence
from the winds going around the tower, sweeps those birds against the tower, and they’re
killed.”


Speaking at a conference, Robbins tells the crowd he once watched more than 500 birds
slam into the monument in one night, and that monument is standing still. Now imagine
wind turbines, some of them about as tall as the Washington Monument, with spinning
blades that reach nearly a football field in diameter.


Alex Hoar is with the U.S. Fish and Wildlife Service. He says a single turbine can now
change air currents for three acres around the turbine itself:


“So, if you put up a hundred turbines, the blades are sweeping 300 acres. So, that’s a large
space. And what we don’t know is when are birds and bats at risk.”


We don’t know because no one has really studied it. Both Alex Hoar and Chandler
Robbins say scientists know a lot about where birds take off and where they land. They
know about migration patterns, but they don’t know about what birds do, or where they
go while they’re in the air.


So, with more wind farms being built across the country, it’s not clear what affect they
might have on bird populations, but some suspect it won’t be good. Peter Kailing works
with an environmental consulting company. He recently did an environmental impact
study for a new 47 hundred acre commercial wind farm in Michigan. He says scientists
can learn a lot from the wind farms that have already been built. He says the ones that
have done the most damage to wildlife have a few things in common:


“The turbine was in a narrow valley, or a mountain-pass, or on the edge of a large
water body with steep wooded cover that was used by migrating songbirds, there’s almost
always a topographical association.”


Weather also plays a role. Peter Kailing and others say that birds tend to avoid cloud
banks by flying under them. That could put them in the path of turbine blades. So, one
way to limit damage would be to shut the turbines down on cloudy days.


Chandler Robbins says better technology could also limit damage. He says turbine blades
could be equipped with sensors:


“If a bird or a bat collided with that blade, it would set up enough vibration so that the
blade could be feathered temporarily to avoid other birds striking until the immediate
problem is over.”


Feathering essentially means that you twist the angle of the blade so that wind passes
over it, rather than pushing the blade into a spin. That way, birds aren’t sucked into it.
It’s basically the turbine’s braking system. Some say you don’t even need a sensor on the
turbine. They say engineers could monitor radar and thermal imaging. That would tell
them if any migrating birds are in the area, and if they are, feather the blades.


Of course, the absolute safest solution in the short term might be just to stop building
wind farms, but you’d be hard-pressed to find anyone who thinks that’s a good idea.
Most seem to realize that any way of making electricity will have some impact on the
environment. The question is what can be done with each of them to minimize the risk.
With wind energy, that work is just getting started.


For the GLRC, I’m Dustin Dwyer.

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Harvesting the Wind (Part 1)

  • Wind turbines can be both a blessing for farmers, as a source of extra income... and annoying to the neighbors. (Photo by Lester Graham)

Wind farms of huge turbines are springing up along coastlines,
windy ridges and blustery farmland. Most of us see them from a distance.
The Great Lakes Radio Consortium’s Chris Lehman recently visited some
of them up close… and has the first of two reports on wind energy:

Transcript

Wind farms of huge turbines are springing up along coast lines, windy ridges and
blustery
farmland. Most of us see them from a distance. The Great Lakes Radio Consortium’s
Chris
Lehman recently visited some of them up close… and has the first of two reports on
wind energy…


If you can imagine the sight… there are 63 wind turbines scattered across the
prairie farmland,
their huge blades sweeping around, capturing energy from the wind. Each turbine is
213 feet
high. You can see them from miles around. But it isn’t until you stand directly
underneath the
80-foot long blades as they rotate in the wind that you begin to appreciate their size…


(sound of wind from underneath turbine)


“This is probably a typical day. They’re probably producing at about 30 percent of
what they are
rated at, and probably on average, for a year, this is what you’d expect.”


Christopher Moore is Director of Development for Navitas Energy. The Minnesota- based
company opened the Mendota Hills Wind Farm in northern Illinois just over a year ago.


Q: “What are some of the highest levels that you’ve reached?”


“Each turbine is capable of producing 800 kw, and there are times when we’ve had the
windfarm
working at about maximum.”


Moore says the Mendota Hills Wind Farm produces enough electricity to power about 15-
thousand homes per year. It’s the first wind farm in the state of Illinois.


Brian Lammers is a Project Manager for Navitas Energy. He says the location is
ideal since it’s
windy here nearly all year long…


“The wind here is more robust in the fall, winter and spring. So we have more
production during
those months than we do during June, July, August.”


Unfortunately, the summer months are the months that most often experience peak
demand for
electricity. Because of that, and because it takes so many windmills to generate
lower amounts of
power, it’s unlikely that current wind energy will completely replace fossil fuel
generated power.


(sound of turbines)


On the flat prairies of Illinois, the giant turbines are the tallest structures for
miles around. You
begin to wonder about things like lightning strikes…


“We might have experienced one or two last year. The turbines are protected from
lightning. The
entire wind farm is grounded, so if there is a strike typically it will just be
grounded down to the
ground grid. There’s typically no long-term damage associated with a lightning
strike. But as you
can imagine, they’re the tallest structures around so there are periodic lightning
strikes.”


Q “What about a tornado? This is tornado country…what would happen if one came
through
here?”


“I don’t know. These turbines are built to withstand everything but a direct strike
from a tornado,
so I think the same thing would happen to a wind turbine that would happen to any
large
structure if they were struck by a tornado. You’d probably have some significant
damage.”


(fade up sound inside turbine)


Inside the turbine, there’s a distinct hum as the blades whirl away at the top of
the hollow shaft.
It’s about ten feet across at the base, and a metal ladder allows anyone brave
enough to climb all
the way to the top.


Despite the hum of the turbine’s blades up close, the sound fades away just a few
dozen feet from
the tower. But noise isn’t much of a concern for this wind farm. It’s in the
middle of a soybean
field and there are no neighbors nearby.


Noise is just one of the aesthetic concerns for neighbors of wind farms. Appearance
is another.
The Mendota Hills turbines are coated with a special paint that appears white in
bright sunshine.
But when the sun’s not out, the turbines appear grey, and seem to blend in with the
cloud-covered
sky.


Dennis Cradduck has 19 of the turbines on his corn and soybean farm. He says the
wind farm
hasn’t been a problem. Of course, he’s getting paid by Navitas for allowing the
turbines on his
land. But he says the wind farm has led to an unexpected benefit: getting to meet
people from
across the country who pull off the highway for a closer look…


“We get people almost on a daily basis that drive by on the interstate and see them,
and stop and
want to look at them, and they’re amazed at them, and most—about 99 percent of them
have been
positive comments. In fact, one fellow from North Carolina stopped the other day
and said ‘I wish
we’d build more of these around the country because we need renewable energy.'”


The prospect of more renewable energy is appealing to most environmentalists. But
some worry
that wind farms can be deadly to birds. A study by the National Wind Coordinating
Committee
found that wind turbines kill an average of two birds per year.


Another concern is that windmills disrupt the scenery. But the only view around
here is farmland
as far as the eye can see. And on this brisk day, it isn’t just corn and soybeans
being harvested: it’s
the power of wind.


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

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