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greenhouse GREENHOUSE

-water vapor. Is the main contributor to the greenhouse effect.
carbon-dioxide. Next in importance to water vapor. Naturally, is emitted by volcanoes and by agencies in their breathing.
-Methane. Issued in the digestion of ruminants, landfills and swamps.

HOW THE GREENHOUSE

solar radiation reaching the Earth is three ways:

-30% is reflected by the atmosphere or the earth's surface and returned to the outer space without nustro planet warms in this process. This is what is known as albedo.
"The 19% is absorbed by clouds and other atmospheric components.
-The remaining 15% is absorbed by the earth's surface increases its temperature.

returns that energy surface that has absorbed, but in the form of infrared radiation. The greenhouse gases absorb infrared radiation, warming the air and hinder the emission of heat into outer space. But in the end just going outside.

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Evidence of climate change


- Retreating glaciers. In recent decades there has been a general retreat of glaciers in the mountains, especially in the northern hemisphere. The process is accelerating and also affects the ice, or ice cap that covers the ocean in polar regions. During the summer, the area covered by Arctic sea ice has decreased by 14%, but its thickness has hevho 40%.


- Increase in sea level. During the twentieth century sea level has risen at a rate between 1 and 2 mm / year. The process is accelerating and, between 1993-2003 the average increase was 3 mm / year. And the result of the merger of much of continental ice and thermal expansion of ocean water.


- Increase in global average temperature. The glacial retreat and sea level rise are nothing more than direct consequences of the increase in average surface temperature of the continents and oceans.



- Extreme weather events are becoming more frequent. Periods of drought, floods, heat waves and cyclones normally form part climate dynamics. However, a feature of climate change is that these extreme events are exacerbated and increase their frequency.


- Many living organisms are changing their behavior and distribution. was observed seasonal changes in rates, changes in the migratory processes of aces in the flowering season of plants n the spatial distribution of species.

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GLOBAL CHANGE

The climate seems to have gone mad. In the last decade has reached the highest temperatures of a century. The ice has disappeared from places where there were glaciers. The sea temperature is also rising. Periods of drought are followed by floods. Some birds migrate to winter in warmer areas have stopped.

The surface temperature rises and the cause is likely to be sought in human activity. The IPCC forecast for the current century, an average increase in temperature between 1.5 º C and 5.8 º C. This implies global calentamineto: climate change, altered d functioning ecosystems, major transformations in land use and biodiversity loss.

global change is one of the biggest problems humanity will face n the coming decades.