Neil Pederson’s introduction to tree rings came from a “sweet and kindly” college instructor, who nevertheless was “one of the most boring professors I’d ever experienced,” Pederson said. “I swore tree rings...

Cooling the Earth by injecting sun-blocking particles into the stratosphere could be “remarkably inexpensive”, according to the most detailed engineering analysis to date.The fear of a rogue nation or military force unilaterally...

Green certified buildings are delivering billions of dollars in health, climate and energy-saving benefits, according to a major new study from Harvard University. Engineering giant United Technologies Corporation (UTC) commissioned a team of...