Various scientists, politicians and activists have long insisted that the United States and world must end fossil fuel use to prevent dangerous manmade global warming, climate change and extreme weather disasters. They say "the science is settled" and the time to act is now.
Many other experts have pointed out that these dire threats are the product of hypotheses and computer models that are largely contradicted by actual observations and historic records for temperatures, tornadoes, hurricanes, floods, droughts, Arctic and Antarctic ice fluctuations, and rates of sea level rise. They note that Earth and humanity have been through Pleistocene ice ages and a Little Ice Age, Roman and medieval warm periods, prolonged droughts and other events that greenhouse gas theory cannot explain--and so far will not try to explain.
