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The problem is we are doing this "blanket" is thicker. This through the burning of coal, oil and natural gas that release large amounts of CO2 into the atmosphere. When felled forests and burn wood to reduce the absorption of CO2 by trees and jointly release the carbon dioxide content in the wood. The raising cattle and planting rice generates methane, nitrous oxides and other greenhouse gases. If the growth of greenhouse gas emissions are maintained at the current rate levels in the atmosphere will double compared to pre-industrial times, during the twenty-first century. If nothing is done it is possible to triple the amount before the year 2100 (GCCIP, 1997).
The scientific consensus as a result of this is that there will surely be an increase in global temperature between 1.5 and 4.5 ° C over the next 100 years. This added to the existing 0.5 ° C increase that has experienced the atmosphere since the Industrial Revolution (UNEP / WHO, 1986).
Able to predict how this will affect the global climate is a very difficult task. The temperature increase will have expansionary effects. Uncertain effects are added to other uncertainties. For example, wind and rainfall patterns that have prevailed for hundreds and thousands of years, of which millions depend, may change. Sea levels could rise and threaten islands and low-lying coastal areas. In a world increasingly overcrowded and under stress, with enough problems in advance, these pressures directly cause greater famine and other disasters (UNEP / WMO, 1994).
According to the World Health Organization (WHO), even a small increase in temperature can cause a dramatic increase in deaths due to extreme temperature events, the spread of diseases such as malaria, dengue and cholera, drought, water shortage and food. This raises the IPCC: "Climate change will certainly lead to a significant loss of life" (Dunn, 1997).
The amount of carbon dioxide has increased from 295 ppm before the industrial era to a current figure of 359 ppm. This increase corresponds to 50% of that expected based on the rate of burning fossil fuels. Several processes appear to act as moderators, for example, the ocean acts as a reserve, where carbon dioxide is dissolved as such and as carbonates and bicarbonates. Increased carbon dioxide in the air, it acts as a stimulant plant growth, so this is fixed over gas. Global warming, in addition to thawing polar layers, it can cause a change in the system airflow, changing rainfall patterns. In this way, for example, the Midwest U.S. (United States agricultural sources), it could become desert, and the growing areas to move toward areas of Canada.
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