Guardian: Global temperatures in the first half of the year were the hottest since records began more than a century ago, according to two of the world’s leading climate research centres. Scientists have also released what they describe as the “best evidence yet” of rising long-term temperatures. The report is the first to collate 11 different indicators — from air and sea temperatures to melting ice — each one based on between three and seven data sets, dating back to between 1850 and the …