Yale Environment 360: Thunderstorms move a significant amount of ozone from the stratosphere down toward the earth's surface a process that could have important impacts on climate, according to a recent study in the journal Geophysical Research Letters. Ozone shields the planet from the sun's ultraviolet rays when it's in the stratosphere, the second-lowest layer of the atmosphere, but ozone acts as a powerful greenhouse gas and pollutant when it's nearer to the earth's surface, in the troposphere. Ozone is created...