Global warming extinctions usually have people picturing the last polar bears or other furry critters disappearing, but the crucial and oft-overlooked world of plants is going to be decimated by climate change. Scientists predict tens of thousands of plant species will disappear by the end of the century. Between warmer temperatures and shifts in rain and snow patterns, between 7% and 16% of the world's plant species are likely to lose at least 90% of their habitat and go essentially extinct in about 55 to 75 years, according to a study in Thursday's journal Science. That equates to roughly 35,000 to 50,000 plant species based on moderate carbon pollution scenarios, and much more if the world's pollution soars, said study co-author Xiaoli Dong, a University of California Davis ecologist. “The warming rate drives the extinction,” Dong said.…