Climate change: Last summer hottest in 2,000 years, trees reveal
Climate change: Last summer hottest in 2,000 years, trees reveal Clues hidden deep in their trunks shows just how unprecedented last year's heat was.climate changeLINK
Climate change: Last summer hottest in 2,000 years, trees reveal Clues hidden deep in their trunks shows just how unprecedented last year's heat was.climate changeLINK