
BIODEGRADABLE: Materials that decompose when naturally occurring organisms, like bacteria and earthworms, feed on them. BIODIESEL FUEL A clean-burning, nontoxic alternative fuel made from animal fats and plant oils. It goes through a refinery process called transesterification, which makes the oil suitable for car engines. CARBON FOOTPRINT: Total amount of CO2 emitted through the use of fossil fuels, like coal and oil, and manufactured products. CARBON NUETRAL: A way to counteract the amount of emissions (like CO2) you contribute to the atmosphere by eliminating them elsewhere in equal measure. GLOBAL WARMING: An increase in the earth’s average...