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As a derecho rolled through the northern Plains Tuesday, the sky turned green. A derecho is a powerful wind storm, but this cluster of storms brought more than just the intense, destructive wind. The ominous green color in the sky is caused by the water and ice inside the storm clouds and is an indicator that the storm is producing large hail. 

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Since we are in the middle of a hot stretch of weather here, let's take a trek to Antartica. Picture this: cold stillness all around you and white snow as far as the eye can see. But then something in the snow catches your eye. Something is wrong with that snow, so you walk closer. Then you realize the snow is green.

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Renewable energy like hydro, solar, geothermal and wind power generation facilities