greenhouse gases

The amount of U.S. greenhouse gases flowing into the atmosphere, mainly carbon dioxide from burning fossil fuels, increased last year by 1.4 percent after a decline in 2006, the Energy Department reported Wednesday.

In order to investigate the greenhouse gas effect in Europe, one has to measure the concentrations of CO2 from fossil fuels at different places all over the continent.

This could be done with 14C tests of air samples, but the same types of measurements can also be carried out on plants that have absorbed CO2.

To that end one would need plant material that is known to come from a specific region and also know which year it grew in.

(Inderscience Publishers) Landfill sites produce the greenhouse gases methane and carbon dioxide as putrescible waste decays.

Growing plants and trees on top of a landfill, a process known as "phytocapping" could reduce the production and release of these gases, according to Australian scientists' writing in a forthcoming issue of International Journal of Environmental Technology and Management.

(Massachusetts Institute of Technology) To prevent global warming, researchers and policymakers are exploring a variety of options to significantly cut the amount of carbon dioxide that reaches the atmosphere.

One possible approach involves capturing greenhouse gases such as carbon dioxide at the source, then injecting them underground.

Now MIT engineers have come up with a new software tool to determine how much CO2 can be sequestered safely in geological formations.

The fate of scores of new coal-burning power plants is now in limbo over whether to regulate heat-trapping greenhouse gases.

Carbon dioxide isn't the only greenhouse gas that worries climate scientists. Airborne levels of two other potent gases  are on the rise, too.

The economic free fall gripping the nation may bring down one of the main environmental objectives: capping the greenhouse gases that are blamed for global warming.

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Mayor Richard M.

Daley has announced a plan to dramatically slash emissions of heat-trapping gases, part of an effort to fight global warming and become one of the greenest cities in the nation.

Voggy adj. Smoggy weather caused when volcanoes, like Hawaii's active Kilauea, release sulfur dioxide that combines with dust and sunlight.