Sunday, January 8, 2012

What Do We Know About Climate Change?

Climate change science had played a main role for understanding the fundamentals of global warming. Now there is no doubt in the main stream scientific community that the earth is warming, and increasing evidence shows that humans had played significant part in it.

For instance we know that the specific gases like carbon dioxide and methane play a major role in determining the Earth’s climate by preventing heat from escaping the atmosphere. Researchers had documented that increased concentration of such environment harming gases are due to of human activities such as burning of fossil fuels, deforestation and land degradation, cattle ranching, and rice farming. Human’s part in global warming has been documented in a growing number of studies.

In 2001, the IPCC’s assessment of the scientific basis of climate change, the experts had drawn three main conclusions:

  1. Human activities are and will continue to keep on changing the composition of the atmosphere. The IPCC stated that emissions of greenhouse gases and aerosols due to human activities continue to change the atmosphere in ways that are expected to affect the climate. Adding that trends of greenhouse gas emissions from human activities point further upward, the scientists force on point of significant emission reductions are necessary to stabilize the climate.
  2. Recent global warming is caused by human activities.  The IPCC states in its assessment, “There is new and stronger evidence that most of the warming observed over the last 50 years is attributable to human activities”.
  3. Climate changes do exists or in the IPCC’s own words: “An increasing body of observations gives a collective picture of a warming world and other changes in the climate system”.

Climate experts using more advanced computer models suggested that the planet temperature will rise over the next generations as a result of this growing concentration of heat trapping gases in the atmosphere. According to experts global warming in 20th century was largest during any century over the past 1,000 years for the Northern hemisphere, and about this 21st century global warming its predicted that there will be more rapid climate change than any time in recorded history.


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