Global Warming (The Environment: Ours to Save)

Living things have average temperatures. For humans, normal body temperature is 98.6 degrees F. For most birds, average body temperature is a little higher - from 104 to 108 degrees F Planets, while not living entities, nevertheless also have average temperatures. Scientist have observed and noted that over the past 100 years the temperature of our planet has been rising. And just as an above-normal body temperature is a warning sign of illness, a growing number of scientists are asserting that the rising surface temperature on Earth-a phenomenon known as global warming--is a global warning sign we need to heed. In this book, readers will learn about the greenhouse effect and how it is connected to global warming.