The ice sheets, called the Laurentide and the Cordilleran glaciers stretched southward to the middle of the continent, covering most of what is now Canada and the area in the Pacific Northwest from Alaska to Tacoma. ... A new mammoth species evolved from the original mammoths as they migrated from Eurasia, over the Bering Land Bridge, leaving substantial populations in Beringia as they progressed southward. ...
Global Warming - Its Implications on the Human Population Though there is some scepticism that climate change is a result of human actions, it is unlikely to be a natural event. ... These figures are not consistent with a natural trend, and, when one considers the tens of thousands of years in which humans have inhabited the earth, and that humans have really only started burning fossil fuels heavily since the industrial revolution, and the fact that the world's population is only going to increase, this number is dauntingly enormous. ...
GLOBAL WARMING Humanity is conducting an unintended, uncontrolled, globally pervasive experiment whose ultimate consequences could be second only to nuclear war. Fossil fuel burning, deforestation, and the release of industrial chemicals are rapidly heating the Earth to temperatures not experie...
