50 million years ago during the Eocene, the Earth was much hotter than it is now, with levels of greenhouse gases methane and carbon dioxide in the atmosphere far higher than today. There was very little ice on the Earth … Continue reading
The future of the world’s climate (long term temperature, rainfall etc) is clearly of importance to everyone. There is clear evidence that the climate has changed in the past, is rapidly changing now and will continue to change in the … Continue reading
Although an African origin of the modern human species is generally accepted, the evolutionary processes involved in the speciation, geographical spread, and eventual extinction of archaic humans outside of Africa are much debated. An additional complexity has been the recent … Continue reading