Many Americans doubt man-made global warming because they don’t think humans could so fundamentally change the world. Some believe only God could alter the climate. But small groups of Homo sapiens have been re-engineering the environment on a massive scale for thousands of years, using only primitive tools. Many scientist think that includes ancient man-made global warming.

Most of us know that humans have been cutting down forests and wiping out animal species for millennia. But we rarely recognize the scale of past people’s impact Continue reading “Ancient Man-Made Global Warming and Environmental Engineering” →