Scotsman: WORLD leaders were yesterday urged to follow Scotland’s example after ministers pledged to plant 100 million trees to cut carbon emissions. The promise is part of a global drive to plant one billion trees by 2015, supported by Climate Group states and regions including California, Quebec and Catalonia. Climate change minister Stewart Stevenson made the commitment at a conference in EdADVERTISEMENTinburgh on energy challenges. He said: “Tackling climate change will …