By Dagomar Degroot
These are momentous times in the history of our planet. Industrialized and industrializing nations, as well as world-straddling corporations, are choking our atmosphere with greenhouse gases in such quantity that the whole Earth is warming with a speed, on a scale, unprecedented in the 300,000-year history of our species. Yet natural forces have repeatedly changed Earth’s climate during that long history, even before the onset of industrialization.