View larger image | A recent study analyzed how quickly climate change would move across the world during the 21st century, depicted above as the velocity one would have to move along Earth’s surface to maintain a constant local temperature. Different ecosystems show varying average velocities (examples at bottom). Source: S. Loarie et al/Nature 2009 Credit: map: S.R. Loarie et al/Nature 2009; images, from left: © Jean-Paul Ferrero/Auscape/Minden Pictures/Corbis; Pi-Lens/Shutterstock; Jacques Jangoux/Photo Researchers, Inc.