Substitute for traditional motor vehicle fuels like gasoline and diesel.; includes biodiesel, ethanol, and compressed natural gas.

A renewable fuel made from vegetable oils and animal fats that can be used in standard diesel engines with little or no modification.

The variety of plants, animals and other living things in a particular area or region.

A measure of impact of human activities on the environment in terms of the amount of greenhouse gases produced, measured in units of carbon dioxide.

The funding of projects that reduce overall greenhouse gas emissions in order to "offset" greenhouse gas emissions caused by an individual or organization.

A part of the Earth that absorbs and holds onto carbon dioxide, such as oceans, soil and forests.

Certified to have been produced without the use of synthetic pesticides and fertilizers, sewage sludge, bioengineering, irradiation, antibiotics or growth hormones.

Commonly found air pollutants that are not acutely toxic but that do pose a threat to human health because so many people are exposed to them over long periods of time.

Nontoxic pollutants that are nonetheless harmful to humans and/or aquatic life (sediment, nutrients, pathogens and trash).

A regional community of farmers and consumers that share in both the risks and the benefits of food production.