Cycles in nature -- The carbon cycle -- Overloading the carbon cycle -- Conclusion.
Summary:
"Earth is a complex system of natural cycles. Carbon, water, and other materials move in and out of rocks, the air, bodies of water, and living things. But human activities have thrown these cycles out of balance. In [this book], learn how Earth's living and nonliving things are connected and how human activities have damaged that connection."--Back cover
This resource is supported by the Institute of Museum and Library Services under the provisions of the Library Services and Technology Act as administered by State Library of Iowa.