CO2 riches: “The Greening of the American West”

“The Greening of the American West” from the Center for the Study of Carbon Dioxide and Global Change by Craig & Keith Idso provides some amazing photographic documentation with paired now and about-a-century-ago pictures of the improvement in tree and brush cover from all over the US. A number of factors could be at work but rising CO2 levels in the atmosphere seem likely to be a major source of the improvement. And maybe global warming helps too. See www.co2science.org