Warmer temperatures have already shifted the growing season in many parts of the Sea levels crept up about 20 centimeters during the twentieth century. Most of the rise happened because water expands as it warms, though melting mountain glaciers also contributed to the change. Sea
levels are predicted to go up between 0.18 and 0.59 meters over the next century, though the increase could be greater if ice sheets in Greenland and Antarctica melt more quickly
than predicted. Higher sea levels will erode coastlines and cause more frequent flooding.
(Graph ©2007 Robert Rohde.) shifted the growing season in many parts of the globe. Spring is coming earlier, and that means that migrating animals have to start earlier to follow food
sources.