tributional range of some species is already shifting, most noticeably in the Sahel.Rising CO2 levels are GREENING the world, and nowhere is that greening more dramatic than the arid Sahel, on the southern fringe of the Sahara desert.Here's a map. Note the dark green swath across the southern edge of the Sahara. That's the Sahel:For source links see:Here's a National Geographic article about it:Here’s an excerpt from that article:“Images taken between 1982 and 2002 revealed EXTENSIVE regreening throughout the Sahel, according to a new study in the journal Biogeosciences.The study suggests huge increases in vegetation in areas including central Chad and western Sudan. ...“’Before, there was not a single scorpion, not a single BLADE of grass,’ he SAID. ’Now you have people grazing their camels in areas which may not have been used for hundreds or even thousands of years. You see birds, ostriches, gazelles coming back, even sorts of amphibians coming back... The trend has continued for more than 20 years. It is indisputable.’”So the ranges of ostriches, other birds, gazelles, and even some amphibians are affected by ANTHROPOGENIC global warming, as well as many plants. But the changes aren’t negative, they are positive.