05.07.2009

Gases such as water vapor, carbon dioxide, nitrous oxide and methane that are transparent to solar radiation but opaque to longwave radiation. Their action is similar to that of a glass in a greenhouse

Generic term for any type of energy which is considered to have a lower environmental impact than commercially-produced energy

Sorry, this entry is only available in עברית.

A geographic area where the gravitational attraction is significantly higher or significantly lower than normal.