Agriculture releases other powerful GHGs, such as methane and nitrous oxide.
Atmospheric concentrations of GHGs have risen from around 280ppm two centuries ago to around 370ppm today, thanks chiefly to mankind's use of fossil fuels and, to a lesser degree, to deforestation and other land-use changes.
Man-made GHGs now cause a forcing of more than two watts per square metre, the equivalent of increasing the sun's brightness by around 1%.
The noisiest challenge comes from two Bush enemies: John McCain, his foe in the Republican primaries in 2000, and Joe Lieberman, who is now running for the Democratic nomination in 2004.The two senators have sponsored a bill the American Investments for Reduction of Emissions Act that would impose, for the first time, a federal restriction on emissions of GHGs.
That will require the stabilisation of atmospheric concentrations of GHGs.
They are working in his fields, helping convert another small patch of peatland, and adding to Indonesia's alarming emissions of carbon dioxide.Stop it, for peat's sakeIndonesia's logging of its rainforests has long been identified as a big contributor to the world's emissions of greenhouse gases (GHGs), and hence to global warming.
The key greenhouse gases (GHGs) have long been ordinary water vapour and carbon dioxide (CO2); if they did not act as a greenhouse, the earth would be a lifeless 30° Celsius colder.
He plots various strategies for reducing GHGs (including the Kyoto one) that will lead in the next century to the stabilisation of atmospheric concentrations of CO2 at 550 parts per million (ppm).
Last year, Mr Bush ditched the Kyoto treaty, an international agreement on global warming that commits industrialised countries to sharp cuts in emissions of greenhouse gases (GHGs).
He then unveiled a weak domestic climate plan in which the targets for reducing the growth in emissions of greenhouse gases (GHGs) were purely voluntary.Yet initiatives are now under way outside the White House that may undermine Mr Bush's approach.
Many people choose to get their electricity from renewable sources so for them turning on the lights don't even increase GHGs.
