Climate has changed when the planet received more or less sunlight due to subtle shifts in its orbit, as the atmosphere or surface changed, or when the Sun’s energy varied. But in the past century, another force has started to influence Earth’s climate that is humanity.
Global warming, in today's era have become a very controversial topic. Basically it is continuous rise in average temperature of earth's atmosphere and the main reason behind it is green house gases which are giving vent to global warming. Humanactivities are turning to be inhuman as they are the ones who are spoiling and destroying the mother earth for their needs andgreeds. They are recklessly killing our environment through deforestation, air pollution, industrialisation and through many more ways.
The impact of global warming is far greater than just increasing temperatures. Warming modifies rainfall patterns, amplifies coastal erosion, lengthens the growing season in some regions, melts ice caps and glaciers, and alters the ranges of some infectious diseases. Some of these changes are already occurring.
These natural causes are still in play today, but their influence is too small or they occur too slowly to explain the rapid warming seen in recent decades.
Human activity since the industrial revolution has increased the amount of greenhouse gases in the atmosphere, leading to increased radiative forcing from CO2, methane and CFCs. The concentration of CO2 and methane have increased by 36% and 148% respectively since 1750. These levels are much higher than at any time during the last 800,000 years, the period for which reliable data has been extracted from ice cores. Less direct geological evidence indicates that CO2 values higher than this were last seen about 20 million yrs ago. The rest of this increase is caused mostly by changes in land-use, particularly deforestation.
There are different views over what the appropriate policy response to climate change should be. These competing views weigh the benefits of limiting emissions of greenhouse gases against the costs. In general, it seems likely that climate change will impose greater damages and risks in poorer regions. Some organisations have also provided their own projections regarding controls and have scaled back their efforts.
