MERCIFULLY the southern US appears to have escaped devastating human consequences from its second hurricane in a month. But can it also escape the lesson on climate change from the increase in powerful and possibly destructive tropical storms? Rita was originally rated in the most ferocious category five with winds over 155 mph. As with all hurricanes, however, it lost power when it went ashore on the Louisiana and Texas coasts, dropping to a Category 3 and then 2 though as the coming hours will show, it has nonetheless caused plenty of damage. Hurricane Katrina which smashed into New Orleans...