The hard evidence can be found no farther away than your kitchen. Put a teapot, or any pot of water on the stove and bring it to a boil. Watch the steam, steam is water vapor. Time how long the steam hangs around on your kitchen. Hour's, day's, or second's or minuets? Water vapor evaporates within seconds. Chemicals put there by plane last for days. Doesn't take an Einstein to figure it out. All you have to do is look and stop believing the lies fed to you by the MSN and gov.