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Environmental

Research confirms that the increase start heating C02

14/05/2012

This article was translated by an automatic translation system, and was therefore not reviewed by people.



 


Fell one of the last bastions of arguing that the burning of fossil fuels does not warm the Earth.

The problem, say the skeptics, is that the CO2 released by burning this did not seem to be causing more heat on the planet in previous geological epochs. The order appeared to be reversed: first the Earth warmed and then the atmosphere gets more CO2.

"The apparent contradiction has to do with the way the snow is deposited," says  paleoclimatólogo Cristiano Chiessi, USP.

It explains: the main records of past climate comes from ice cores from Antarctica. In places the snow, this "library" icy reaches hundreds of millennia.

The composition of the ice gives clues about the temperature at the time the snow fell, while air bubbles trapped in ice mass indicate how much CO2 was in the air.

"The problem is that these things happen in different pace. When the snow falls, it becomes very permeable to air time above it. It takes time for the bubbles to form, "says Chiessi.

Results: The models indicated that the air trapped in bubbles is always more "new" next to the ice. So I could not tell what was the order of events, a real chicken and egg problem.

An article in "Nature" last month, signed by Jeremy Shakun, Harvard University, circumvented this by joining data from other Antarctic records worldwide. Research shows that at the end of the last ice age, the order was even more CO2 and temperature increase after the first.

An important detail: in a hundred years, atmospheric CO2 levels increased in the same proportion as the entire increase in 10,000 years at the end of the last glacial phase.

What can cause such a change as well as more heat? A track is a study led by Maria Assuncão da Silva Dias, also from USP, which saw an increase of one third in the Greater Sao Paulo rain in less than a century.

Much of this has to do with natural factors and the excess buildings of the metropolis.
"But the change resembles a test that is expected to come in the future with more extreme events," says Silva Dias-like storms in the dry season, did not exist before, and more time as a whole.



Source: Environment Brazil

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