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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Ten Threats: Protecting Crumbling Shorelines

  • This is a private beach Charles Shabica developed for a homeowner on Chicago's North Shore. The grasses in the background are native to the area and help stabilize the beach and bluff. They also help trap and filter runoff. (Photo by Shawn Allee)

One of the Ten Threats to the Great Lakes is changing how the shoreline interacts with
the lakes. Humans like to improve on nature. For example, we like to build things to
protect our property. Protecting a home from forces like wind, water and soil erosion can
be a tough job and expensive sometimes. But if your property is along the shore of a
Great Lake, it can be especially difficult. Reporter Shawn Allee looks at one engineer’s
effort to protect lakefront property and nature:

Transcript

We’ve been bringing you reports from the series ‘Ten Threats to the Great Lakes.’ Our
guide in the series is Lester Graham. He says the next report looks at protecting property
and protecting nature:


One of the Ten Threats to the Great Lakes is changing how the shoreline interacts with
the lakes. Humans like to improve on nature. For example, we like to build things to
protect our property. Protecting a home from forces like wind, water and soil erosion can
be a tough job and expensive sometimes. But if your property is along the shore of a
Great Lake, it can be especially difficult. Reporter Shawn Allee looks at one engineer’s
effort to protect lakefront property and nature:


Great Lakes shorelines naturally change over time. Beaches erode. Dunes shift.
Sometimes, even the rockiest bluffs collapse.


That’s OK for nature, but maybe not for a house sitting on top of it. So it’s no wonder
that landowners try to stabilize their shorelines. To do that, they sometimes build walls
of steel or concrete to block incoming waves. It’s a tricky process. If the walls are too
short, they won’t stop erosion. But if they’re too long, they trap sand that moves
naturally along the lakeshore.


When nearby beaches can’t get sand, they degrade into muddy or rocky messes.


Charles Shabica is a coastal engineer. He’s been working at the problem for decades
now.


“My dream is to see the shores of the Great Lakes ultimately stabilized, but in a good
way and not a bad way where you’re causing problems.”


Shabica takes me to a small private beach north of Chicago. He engineered it to keep the
shoreline intact. The keys to that are two piles of rock that jut out into the lake.


The piles are just the right size – big enough to protect the shore, but small enough to let
some sand pass by. There’re other elements to the design as well.


Tall, blue-green grasses line the beach’s perimeter.


“Not only do waves tend to move sand around, but wind is also really an important agent,
too. So the beach grass and dune grass tends to stabilize the sand. And what will happen
is, you can see these things are seeding now, wind will blow the seeds and pretty soon
you get that stuff growing all over the place.”


A lot of homeowners and city planners applaud Shabica’s work. But not everyone does.


Some environmental groups say, once a landowner builds a wall or rock formation,
others have to follow suit, just to preserve their own sandy shoreline.


The environmental groups’ alternative? Keep development farther away from shorelines
and allow more natural erosion.


But that hands-off approach is not likely to happen. The majority of Great Lakes
shoreline is privately owned. And in many states, landowners often prevail in court when
they try to protect their investments.


Keith Schneider of the Michigan Land Use Institute says the question isn’t whether to
build near the shore, but how to do it.


He says, in the past, landowners tried to get off cheap. They didn’t pay for quality
construction or get expert advice on local geological systems.


“If you don’t pay a lot of attention to these systems, it’s gonna cost you a lot of money.
And if you build inappropriate structures or inappropriate recreational facilities, you’re
going to either be paying a lot of money to sustain them or you’re gonna lose them.”


A lot of coastal geologists agree that, for much of the Great Lakes coast, private
shoreline protection efforts – even the bad ones – are here to stay.


In urban or suburban areas, housing developments near the shore often include a buffer or
wall.


Michael Chrzastowski is with Illinois’ Geological Survey. He says, in these cases, the
shore can look natural…


“But it’s going to be a managed, engineered facility, because wherever you are on the
shore, you’re influenced by some other construction or historical development along the
shore that’s altered the processes where you are.”


That’s definitely the case along highly-developed, urban coastlines, such as Illinois’.
Other parts of the region are catching up, though.


“What’s going to happen is, other places along the great lakes as they become more
developed and they become more urbanized, they’re going to use Illinois as a model.”


That could bring more projects like Charles Shabica’s little beach. Shabica says that’s
not necessarily a bad thing.


It’s just a way to come to terms with our presence along the lakes.


“Human beings are here to stay. It’s our responsibility I think to make our environment
better for us, but not at the expense of the biological community, and your neighbors.”


That sounds reasonable enough. But it will ultimately mean the vast, natural coastlines of
the Great Lakes will be engineered, one beach at a time.


For the GLRC, I’m Shawn Allee.

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