Scientific American: A new study warns that cold-blooded land animals like lizards and insects in the tropics may wither as the world warms. “Cold-blooded” is the layman’s term for ectotherms–animals whose body temperature is contingent on the surrounding environment, rather than internally regulated like that of warm-blooded creatures. They thrive in temperatures ranging from 68 degrees to 104 degrees Fahrenheit (20 to 40 degrees Celsius), above which they overheat. As the globe warms, researchers warn they …