A team of American and Canadian researchers has found proof of global warming: the temperature of the Earth?s crust is increasing at a remarkable rate. ?We can now say we truly have global warming,? says Dr. Hugo Beltrami, a geophysicist at St. Francis Xavier University in Nova Scotia.

Until now most data on global warming has been obtained from the atmosphere, polar icecaps and oceans, but Beltrami?s team looked at continental rocks, which cover about 30% of the planet?s surface. They studied 616 deep bore holes that were drilled into rock formations from Africa to the Arctic and found evidence of a sharp rise in temperature over the past 500 years.

A group of scientists in the U.S. and England says there is no proof we are experiencing global warming, and if we are, increased greenhouse gas emissions may not be the cause. They argue that temperature rise projections this century are ?unknown and unknowable? and say it?s ?a media myth? that only a few scientists share their skepticism.

The scientists, a group convened by the American George C. Marshall Institute, have published a report which claims to be ?the result of an extensive review by a distinguished group of scientists and public policy experts of the science behind recent findings of the United Nations Intergovernmental Panel on Climate Change (IPCC).?

The last three months were the warmest on U.S. record books, and January was the warmest in the 123 years that temperatures for that month have been recorded globally. The warmth stretched from western states like Montana and Oklahoma to the East Coast. Minnesota, Wisconsin, Iowa, Massachusetts and Vermont saw the warmest November-January period on record.

Professor Mark Meier of the University of Colorado says scientists have seriously underestimated the rise in sea levels that will occur this century. His team came to this conclusion by examining the rate at which glaciers and ice caps are melting because of rising temperatures on Earth.

They say these areas to be retreating far faster than previously thought, and the run-off waters will lift the height of the oceans well above that recently predicted by the UN?s Intergovernmental Panel on Climate Change. ?The glacier wastage at the moment is unprecedented,? Meier says. ?In some glaciers, like the South Cascade Glacier in Washington that I have studied for years, we know that the present rate of melting is greater than it ever has been for the last 5,000 years.?