Daily Climate: Global warming may give a minor twist to that classic hippie bumper sticker that quips "Acid rain: Too bad it's not as much fun as it sounds." Turns out a warming climate could boost the medicinal and psychoactive properties of plants including cannabis. But that`s not all: Climate change will also open up higher elevations to growing weed clandestinely on public lands, a practice that`s putting increased strain on fragile ecosystems. Some say relaxed marijuana laws exacerbate the problem by bringing...