Telegraph (UK): The past decade was the hottest in the northern hemisphere for at least 1,300 years, scientists have found. Despite the damp and gloomy summer, with the Met Office saying this has been the dullest August on record, temperatures across the world have been consistently hotter in recent years than at any time since the Dark Ages. With a lack of widespread climate records from thermometers before the mid 19th century, scientists have generally used data from tree-rings to look at …