The IPCC has declared man-made climate change "unequivocal." The hard part: trying to stop it
"We are above the high scenario now," says climatologist Stephen Schneider of Stanford University. "This is not a safe world."
The IPCC notes that there are cost-effective solutions, such as retrofitting buildings for energy efficiency, but says they must be implemented in short order to stem further damage. "We are 25 years too late," Schneider says. "If the object is to avoid dangerous change, we've already had it. The object now is to avoid really dangerous change."