Global warming is the long-term heating of Earth's atmosphere graduallydue to the accumulation of greenhouse gases that disturb the Earth's heat budget. It has been increasing steadily since the industrial revolution according to 'Nature'.The reasons behind this are human activities that include fossil-fuel burning and agriculture primarily. The world is now about 1.2C warmer than it was in the 19^th Century - and the amount of CO2 in the atmosphere has risen by 50%.

Global warming did not develop at the same time across the planet. The tropical oceans and the Arctic were the first regions to begin warming in the 1830s. Europe, North America and Asia followed roughly two decades later and so on the Southern hemisphere.

Reasons behind increasing the Earth's temperature in the post-industrial revolution period:

• Anthropological Reasons
  
  
• Burning fossil fuels: Fossil fuels are burnt to generate electricity and power vehicles. It led to the release of CO2, SOx and other GHGs. Burning fossil fuels generates greenhouse gas emissions that act like a blanket wrapped around the Earth, trapping the sun's heat and raising temperatures.
  
  
• Deforestation & Tree-Clearing: Deforestation to expand farmland and industrial usage disturbed the climate regulation by trees and plants. According to WWF, up to one-fifth of global greenhouse gas pollution comes from deforestation and forest degradation.
  
  
• Agriculture & Farming: Animals and livestock produce methane, a greenhouse gas. Some that farmers use also release nitrous oxide, which is another greenhouse gas.
  
  
• Increasing population: Ever-increasing human population led to deforestation, emission of CO2 through breathing, emission of CFCs through air conditioners and refrigerators. It caused the temperature to rise.
  
  
• Apart from the above-mentioned human-induced reasons, there are some natural reasons like volcanoes, water vapour, forest fires and melting of permafrost that regularly cause emission of various GHS in the atmosphere to increase the global temperature.
  
  

According to the latest IPCC report, global warming will reduce Arctic permafrost, emitting methane and CO2 only to cause more temperature increases. Global warming causes rising sea levels and irregular seasons affecting human lives. Therefore, there is an urgent need to control it.