Carbon dioxide and other `greenhouse' gases are increasing in the atmosphere due to the burning of fossil fuels, the destruction of rain forests, etc., leading

Looks at the food cycle, including the relationship between low level food producers, plant eaters, carnivores, and top predators.

Nitrogen is an essential element for plant growth and development and a key agricultural input-but in excess it can lead to a host of problems for human and eco

An award-winning author and artist explain how every link in a food chain is important because each living thing depends on others for survival. "Clear, simple

Discusses the role food plays in our health, where different foods come from, and how food is processed for sale around the world. Includes scientific activitie