22-09-2017, 07:19 PM
hey... i just want to know how can I write my evs project on global warming?
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global warming pdf
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hey... i just want to know how can I write my evs project on global warming?
23-09-2017, 09:41 AM
Global warming, also known as climate change, is the increase observed at the scale of the century in the average temperature of the Earth's climate system and its related effects. Several lines of scientific evidence show that the climate system is heating up. Many of the changes observed since the 1950s are unprecedented in the record of instrumental temperature dating back to the mid-nineteenth century, and in the proxy paleoclimatic records covering thousands of years.
In 2013, the fifth assessment report of the Intergovernmental Panel on Climate Change (IPCC) concluded that "human influence is very likely to have been the dominant cause of warming since the mid-twentieth century." The greatest human influence has been the emission of greenhouse gases such as carbon dioxide, methane and nitrous oxide. Projections of the climate model summarized in the report indicated that during the 21st century world surface temperature is likely to increase from 0.3 to 1.7 ° C in the lower emissions scenario and from 2.6 to 4.8 C at 8.6 ° F) in the highest emissions scenario. These findings have been recognized by the national science academies of the major industrialised nations and are not disputed by any scientific body of national or international rank.
Future climate change and associated impacts differ from region to region around the world. Expected effects include increased world temperatures, rising sea levels, changing precipitation, and expanding subtropical deserts. Warming is expected to be higher on land than on the oceans and higher in the Arctic, with the continuous retreat of glaciers, permafrost and sea ice. Other likely changes include more frequent extreme weather events such as heat waves, droughts, heavy rains with floods and heavy snowfall from ocean acidification; and extinctions of species due to changes in temperature regimes. Significant effects on humans include the threat to food security resulting from declining crop yields and the abandonment of populated areas due to rising sea levels. Because the climate system has great "inertia" and greenhouse gases will remain in the atmosphere for a long time, many of these effects will persist for not only decades or centuries, but for tens of thousands of years.
Possible societal responses to global warming include mitigation through the reduction of emissions, adaptation to their effects, construction of systems resistant to their effects and possible future climate engineering. Most countries are parties to the United Nations Framework Convention on Climate Change (UNFCCC), whose ultimate goal is to prevent dangerous anthropogenic climate change. Parties to the UNFCCC have agreed that deep cuts in emissions are required and that global warming should be limited to well below 2.0 ° C compared to pre-industrial levels, with efforts to limit warming to 1.5 ° CF).
Public reactions to global warming and concern about its effects are also increasing. A global report from the Pew 2015 Research Center showed that a median of 54% of all respondents asked to consider it "a very serious problem." There are significant regional differences, with the Americans and Chinese (whose economies are responsible for the largest annual CO2 emissions) among the least affected.
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