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Published: Sunday 22 September, 2013

cheap longchamp bags uk cheap longchamp bags uk Global Warming Potential

If youve read an article or two about climate change and greenhouse gas emissions, you may have seen the term Global Warming Potential. Youve probably deduced that it has to do with the degree to which greenhouse gases cause global warming, but most people are in the dark on how this is measured, so we thought wed give you a little primer.

According to the EPA, The definition of a GWP for a particular greenhouse gas is the ratio of heat trapped by one unit mass of t cheap longchamp bags uk he greenhouse gas to that of one unit mass of CO2 over a specified time period.

There are many greenhouse gases, including methane and nitrous oxide, which have global warming potentials of 23 and 296, respectively. Carbon dioxide and other lower GWP chemicals can be taken out of the atmosphere by sinksa sort of reservoir that collects chemicals. Trees are a primary example of carbon sinks because they take carbon dioxide out of the atmosphere and store it.

But there are no sinks for the three groups of high GWP gases, which are the most potent of greenhouse gases. The three high GWP gases include hydrofluorocarbons HFCs, perfluorocarbons PFCs, and sulfur hexafluoride SF6.

HFCs have a g cheap longchamp bags uk lobal warming potential that ranges from 140 to 11,700, and they can persist in the atmosphere from about a year to 260 years, depending on their molecular composition. Most commercially used HFCs, however, have a maximum lifetime of about 14 yearslong enough to do plenty of damage.

PFCs pose a far greater risk. The two most common PFCs have global warming potentials of 6,500 tetrafluoromethane and 9,200 hexafluoroethane. Their global warming potential is so high because, at a molecular level, they are very stable so they dont break down easily. In fact, only the powerful UVrays in the mesosphere, some 60 kilometers above Earth, can destroy these gases, and it takes thousands of yea cheap longchamp bags uk rs for them to travel the mesosphere. Effectively, once theyre out in the atmosphere, theyre doing irreparable damage.

As if PFCs didnt sound bad enough, SF6 has a staggering global warming potential of 23,900. It is the most potent gas ever measured by the Intergovernmental Panel on Climate Change. cheap longchamp bags uk