World Temperatures Keep Rising With a Hot 2005

New international climate data show that 2005 is on track to be the hottest year on record, continuing a 25-year trend of rising global temperatures.

Climatologists at NASA's Goddard Institute for Space Studies calculated the record-breaking global average temperature, which now surpasses 1998's record by a tenth of a degree Fahrenheit, from readings taken at 7,200 weather stations scattered around the world.

"At this point, people shouldn't be surprised this is happening," said Goddard atmospheric scientist David Rind, noting that 2002, 2003 and 2004 were among the warmest years on record.
Many climatologists, along with policymakers in a number of countries, believe the rapid temperature rise over the past 50 years is heavily driven by the burning of fossil fuels and other human activities that have spewed carbon dioxide and other "greenhouse gases" into the atmosphere. A vocal minority of scientists say the warming climate is the result of a natural cycle.

Several scientists said yesterday that Earth's rapid warming could become self-perpetuating as the buildup of heat in the air, on land and in the sea accelerates. Ted A. Scambos, the lead scientist at the National Snow and Ice Data Center in Boulder, Colo., said the shrinkage of sea ice in the Arctic makes it more likely that the region will warm faster, because open water absorbs much more heat from the sun than snow and ice.

"Change is really happening in the Arctic. We're going to see this again and again," Scambos said. He added that, because the Arctic helps keep global temperatures down, any warming there can mean "you're going to change [the world's] climate significantly."