Definitions - j

Jatropha Curcas is a bio-fuel crop that is being widely touted as a sustainable and more efficient alternative to first generation feed stocks, such as corn and palm oil.

Firms seeking to commercialise the jatropha-based biofuels, argue that the plant delivers high yields of oil and can be grown in marginal areas with low levels of water, limiting the extent to which cultivation would eat into existing agricultural land and water resources.

Rivers of high-speed air in the atmosphere. Jet streams form along the boundaries of global air masses where there is a significant difference in atmospheric temperature. The jet streams may be several hundred miles across and 1-2 miles deep at an altitude of 8-12 miles. They generally move west to east, and are strongest in the winter with core wind speeds as high as 250 mph. Changes in the jet stream indicate changes in the motion of the atmosphere and weather

Energy Efficiency is when you use less energy to accomplish the same task, for example heating your home or washing clothes. Using less energy by being more efficient means less air pollution and lower costs.

To save energy in your home, you can use weather stripping, solar water heating, passive solar or compact fluorescent light bulbs. Also when shopping for household appliances, look for the Energy Star to find appliances that use less energy and lower your electricity costs.

You can also reduce your heating and cooling costs by installing better insulation.