He wandered and hitchhiked from prairie to desert to forest to roadless area.

BBC: Call of the wild

They look at a forest or a desert and they track rainfall patterns, or air and soil temperatures, what plants grow there and who eats what.

NPR: Warming Will Create Micro-Climates, Scientists Say

Natural aerosols are produced by sea salt, desert dust, volcanic eruptions and smoke from forest fires.

ECONOMIST: Climatology: Grey-sky thinking | The