This is a beautiful book and Bang and Chisholm have taken a difficult, complex subject and made it understandable through text illustrations.  They have explained how fossil fuels have come to be and how humans use them, and go on to explain how so much usage has changed the earth.  There is no need for speculation if climate change exists, it has been scientifically proven that it does.  The authors do not use scare tactics but does compare the past to the  present to demonstrate how the earth is warming and poses the question to the reader, what can you do about it?