Although animals have evolved over geologic time to Earth’s constantly changing environments, and although the extinctions of certain species are normal, in no other time in the planet’s history has the extinction rate climbed as high as it is today. Causes of this unprecedented extinction rate include destruction of wildlife habitat, pollution, overfishing, and poaching.

The focus of this informative book is on Earth energy resources, such as renewable power from water, ocean energy, solar energy, wind energy, and biofuels, as well as non-renewable sources.