Describes the force of electromagnetism and how it works.

Global warming has become one of the most talked-about topics in the scientific community. Many scientists believe that humans are to blame for climate change and have presented a great deal of scientific evidence that shows Earth's climate is warming at an alarming rate. Others claim that climatic changes are due to natural causes that have operated throughout Earth's history or that global warming is nothing but a hoax designed to scare people into changing their way of life. By examining the history and scientific facts behind climate change and the role humans may be playing in it, Global...