footnote: Global Warming & Snowball Earth

Just today I have been watching LIFE ON OUR PLANET, a new documentary narrated by Morgan Freeman I surveys the origins and progression of life on Earth. It covers in far more detail, graced with Freeman’s compelling voice, some of the very same geologic history I presented in my essay here. I am tickled by the coincidence as much as by the validation for my own words, and I heartily recommend finding this presentation of the best of our current knowledge and theory of Earth’s history.