The Earth has been witnessed global climate changes throughout its history. Different factors influence on global climate change. Nowadays as most scientists say the most significant factor is a mankind and the results of its activities. We invent different things to facilitate our life but the effects play a bad role for our universe. But we know perfectly well that global climate change took place centuries ago when the mankind was not so developed and advanced as we now are. And our evolution has not stopped we are moving forward. So what should we expect in 10-20 years?

During the last years scientists have been speaking about global warming. According to the National Academy of Sciences, the Earth's surface temperature has risen by about 1 degree Fahrenheit in the past century, with accelerated warming during the past two decades. There is new and stronger evidence that most of the warming over the last 50 years is attributable to human activities. Human activities have altered the chemical composition of the atmosphere through the buildup of greenhouse gases - primarily carbon dioxide, methane, and nitrous oxide. The heat-trapping property of these gases is undisputed although uncertainties exist about exactly how earth's climate responds to them.

The U.N. International Panel on Climate Change (IPCC) estimates that global temperatures will rise 2 to 10 degrees by 2100. A "middle of the road" projection is for an average 5-degree increase by the end of the century, says Caspar Amman of the National Center for Atmospheric Research in Boulder, Colo. What the various factions don't necessarily agree on is what to do about it. The heart of the discussion is "really about how to deal with global climate change, not whether it's happening," says energy technology expert James Dooley of the Battelle Joint Global Change Research Institute in College Park, Md. "What are my company's options for reducing greenhouse gas emissions? Are there new business opportunities associated with addressing global climate change? Those are the questions many businesses are asking today." This is the view of American scientists on global climate change.

There is an opposite view on the same problem. Russian scientists say that in 20012 or 2013 global cooling will start. Taking into consideration 2006 severe winter this opinion has some basis. The same low temperatures (-30⁰C and below) were observed in the central part of Russia in 1949s and in 1970s. But during the last 20 years winters were not so cold. The cause of the expected global cooling is a decrease in the flow of the Sun's radiation. "We have already witnessed a cooling of the kind in Europe, in North America and Greenland in 1645-1705, with canals freezing in Holland, and people abandoning settlements because of nearing glaciers in Greenland. This is what we are expecting again in some decades," Khabibulo Absudamatov from the Russian Sciences Academy Observatory says. According to Absudamatov by 2035 the Sun's radiation will reach its minimum, and 15 years later a deep cooling of the Earth's climate should be expected.