Herald Scotland: Scottish emissions of the most powerful greenhouse gas have increased dramatically over the last 15 years, dwarfing the reductions in carbon dioxide achieved over the same period. Found in many industrial products, sulphur hexafluoride (SF6) is 24,000 times more effective than carbon dioxide at trapping heat in the atmosphere — the cause of global warming. A new UK Government report shows that Scotland`s production of SF6 has increased by two-thirds since 1995. The …