In general, temperatures will continue to rise as greenhouse gases
increase, and El Ninos add an extra boost,'' said Tom Karl, director of the National Climatic Data Center, who concurred with the British prediction.
Using their new model, which includes variations of the solar cycle, the researchers calculated that future increases in greenhouse gases
could reduce the density of the air at that altitude--which is approximately one-billionth as dense as it is at sea level--by about another 3 percent by 2017.
According to the standard global-warming model, trapping extra heat via greenhouse gases
should cause the oceans to warm.
Hansen, NASA's top climate expert, says that if actions are not taken to curb greenhouse gases
within the next 10 years, Earth could undergo such big changes in temperatures, sea levels, and polar ice that it would "constitute practically a different planet" by the end of the 21st century.
These greenhouse gases
include water vapour, with a mean residence time of about 10 days in the atmosphere, carbon dioxide (50-200 years), methane (12 years) and nitrous oxide (120 years).
The comprehensive Energy Policy Act of 2005 that Moniz cites provides loan guarantees to develop energy technologies, including nuclear power, that avoid, reduce, or sequester greenhouse gases
The UK figures show the total amount of greenhouse gases
- which contribute to global warming - fell 10% between 1990 and 2002.
The trouble starts when unusually large amounts of greenhouse gases
build up in the atmosphere.
Cut both results in half, and accumulating greenhouse gases
would still account for only about half of the warming seen in the last century.
It is believed companies emitting greenhouse gases
will buy the credits from Pelangio and other firms directly, or through trading houses already in operation.
The agricultural sector has a tremendous capacity for removing carbon dioxide from the atmosphere and abating the emission of its own greenhouse gases
Intergovernmental Panel on Climate Change, which stated that "when the latest atmospheric models are run with the present concentrations of greenhouse gases
, their simulation of climate is generally realistic on large scales.