Guardian: Awful August, the weather forecasters call this unseasonably cold, wet month, as holiday-makers huddle against intermittent monsoon downpours, reminded that global warming doesn’t necessarily mean a Mediterranean Britain. Every month, reports from climatologists deliver worse predictions of the speed and tipping points for irreversible climate change. A 4C temperature rise is the latest warning: it would bring unimaginable horror in its wake. The time to act gets shorter, but the …