Guardian: Climate sceptics such as Nigel Lawson who argue that global warming has stopped have their “heads in the sand”, according to the UK’s Met Office. A recent dip in global temperatures is down to natural changes in weather systems, a new analysis shows, and does not alter the long-term warming trend. The office says average temperatures have continued their rising trend over the last decade, and that humans are to blame. In a statement published on its website, it says: …