Guardian: Unless there is timely action on climate change, California’s agricultural bounty could be reduced to a dust bowl and its cities disappear, Barack Obama’s energy secretary said today. The apocalyptic scenario sketched out by Steven Chu, the Nobel laureate appointed as energy secretary, was the clearest sign to date of the greening of America’s political class under the new president. In blunt language, Chu said Americans had yet to fully understand the urgency of dealing with …