Earth's atmosphere acts like a blanket to keep heat from the sun, so that the earth has life. The phenomenon of climate change is caused by the accumulation of emissions causing the greenhouse effect (Hunk) in the atmosphere. Concentration increases as thick hunk of shield (atmosphere), so a larger amount of heat needed to be retained, the heat makes the Earth warmer. Emissions causing greenhouse gases emitted from burning fossil fuels, burning of forest land for production and other agricultural activities. Emissions causing the greenhouse effect are well known.