A huge level climate change in the current time attracts the people’s attention very easily. Every one of us is feeling very clearly from the short-term changes in the seasonal patterns of temperature, drought, rainfall without season, changing weather patterns, etc to the long-term changes affecting the entire earth. Climate is a long-term weather trend affecting human lives positively or negatively. Climate change is the long term variations in the weather patterns. Climate itself adjusts time to time however going at wrong path since many years because of regular loss of huge ice sheets. Earlier the earth atmosphere was covered with ice sheets which were able to make the earth atmosphere cool by preventing earth from heat and sending back extra heat out of the space from the earth.
Climate has changed from cooler to warmer over the last two million years in the cyclical manner. Sun is the ultimate source of heat energy which fuelling the weather systems after reaching to the earth. Earlier the harsh and extended bitter cold season was called as the little ice age which was due to the huge level variations in the solar activity. It is found that the positive human activities may play major roles in shaping earth’s climate. Such a huge variations in the climate may lead to the danger of the human lives. Earlier it was believed that shifts in the climate pattern from ice age to warmer periods was because of time however later it was imagined that it is due to regular melting of ice sheets of more than a kilometre in thickness. Our climate is getting warm rapidly by the rate of approximately 8°C over the course of 10 years.
A huge industrial revolution in the modern time has largely impacted the global climate system by increasing the amount of greenhouse gases in the earth’s atmosphere. Heat trapping nature of the green house gases contributes to the global warming. According to the Intergovernmental Panel on Climate Change (IPCC), the increase in earth’s average surface temperature by 20th century has been approximately 0.6°C. It has also been recorded in the northern hemisphere over the last century that there is decrease in snow cover by 10 percent, decrease in spring and summer sea-ice by 10-15 percent, increases in rainfall and its intensity, huge level change in shifts of ice freezes and breaks up in the rivers and lakes.