When we were in Iowa a couple weeks ago we saw lots of these windmills between Des Moines and Omaha. They are windmills that collect energy. In these big groups they are called wind farms. Farmers can lease their land to the power companies or they can purchase these 
$40k windmills to provide their own electricity or at least cut their costs. There are currently over 600 of these in Iowa that create enough power for 140,000 homes. The ones in northern Iowa cannot be more than 100 feet tall but I'm not sure how big these were. I found this photo online. You can see how little the cars appear to be - so they have to be huge! We all need to find at least a few things we can do to be more environmentally friendly...I'm on the hunt for a few things we can do!
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