Change climate to cool down the planet
To drop 1 - 2 tonnes of sulphur would cost 25 - 50 billion dollars.Climatic warming threatens the planet, and it is necessary to make everything to avoid it. But if it was already too much late ? Certain scientists think of "cooling down " the planet artificially. A resolution of last resort.
Reflective mirrors in the space
Against warming, can they cool down the planet ?
Put air-conditioning in its car, it is easy, but cool down whole planet, it is much more complicated. Ed Teller, one of the most bright American scientists died in 2003, has already recommended to send 50 000 reflective mirrors on orbit between the Sun and the Earth to intercept a party(part) of the solar radiation. An idea taken back(resumed) by the physicist Lowell Wood who plans to unfold a huge mirror of 2000 km in diameter in the point Lagrange, where gravitational force of the Earth and the Sun cancels each other out. globalwarming awareness2007 Expense of operation : at the very least 100 billion dollars. And at best 2 % of the solar radiation would be diverted.
Drop dusts of sulphur in the atmosphere
Certain climatologists begin too leaning over subject. The most knowing is Paul Crutzen, Nobel prize of chemistry in 1995 for his jobs(works) on the ozone layer. Her(its) idea is to drop a million tonnes of sulphur or sulfide of hydrogen in the stratosphere. One time burned, these compounds are transformed into particles of sulphate, which reflect solar radiations. This technology is perfectly realistic : it that is noticed(observed) of course during volcanic eruptions. The eruption of Pinatubo in 1991, which had spat out 10 million tonnes of sulphur in the atmosphere, had caused(provoked) for instance a reduction of a half degree of the temperature of the Earth during one year,globalwarming awareness2007.
The fact remains that measure has a price : to drop 1 - 2 tonnes of sulphur would cost 25 - 50 billion dollars. " But they must put opposite the environ mental and social advantages brought by the reduction of the temperature, as the slightest elevation of the level of the sea " justify Paul Crutzen. Problem : these spray cans also generate acid rains. Re-freeze the ice sheet
One of other fears of warming, it is the modification of the common sailors, and particularly the disappearing of the Gulf Stream, which warms up the European coasts(ribs). The cast iron of the glaciers draws away a surplus of fresh water which makes fall the specific gravity of cold and salt waters of the Arctic, globalwarming awareness2007 which are not then replaced any more with the flux of hot water of the Gulf Stream.
Peter Flynn, a Canadian researcher of Alberta’s university, offers simply to re-freeze the ice sheet. 8000 floating barges(black-tailed godwits) would pump some seawater to pulverize it on the floe, which would thicken by freezing. By melting, floe would feed deep currents with dense salt water. Flynn maintains that his(her) resolution is the most economic, since it would cost "only " 50 billion dollars.
* In knowledge more * * File : climatic warming * File : is it necessary to believe weather forecast in predictions ? * Already tomorrow : make rain at pleasure
Capture CO2 in the ocean
The simplest would really remain to avoid in CO2 to escape in the atmosphere. The ocean constitutes the best possible reservoir : every year, it absorbs already 18 billion tonnes of CO2. But according to certain researchers, globalwarming awareness2007 they could play better by doping the activity photosynthesis of the phytoplankton.
Experiments so showed as to nourish the phytoplankton with some iron could multiply its growth by 30 or 40 ! In 2001, the American engineer Mike Markels pretended so he will trap the entirety of the American production of CO2 by spreading 250 000 tonnes of powder of iron in the ocean. Alas, all carbon does not have to do is to be absorbed by microseaweeds : once in the bottom of the oceans, organic matter is going to oxidize by using(consuming) the oxygen dissolved in seawat er. What would have the effect the proliferation of productive microbes of protoxide of nitrogen, a gas with greenhouse effect more powerful beaucup than CO and that on top of that destroys the ozone layer ! Besides, according to Burke Hales which participated in an experience of this type in 2002, globalwarming awareness2007 , " extraction and transport of the iron necessary for fecundation would use(consume) advantage of CO2 that that stocked in finale ".
In brief, the best means to keep(guard) our good old climate, globalwarming awareness2007, it is not to change it. And therefore to decelerate our consumption of fossil energies seriously.