Global warming is the ongoing rise of the average temperature of the Earth's climate system and has been demonstrated by direct temperature measurements and by measurements of various effects of the warming.Global warming is the long-term heating of Earth's climate system observed since the pre-industrial period (between 1850 and 1900) due to human activities, primarily fossil fuel burning, which increases heat-trapping greenhouse gas levels in Earth's atmosphere.

Global warming occurs when carbon dioxide (CO2) and other air pollutants and greenhouse gases collect in the atmosphere and absorb sunlight and solar radiation that have bounced off the earth's surface.Global Warming. The thicker layer of greenhouse gases traps more heat. This result in an increase in average temperature of the earth and the earth becomes hotter and hotter. This is called global warming. If we do not take steps to reduce global warming, it will lead to loss of human lives, plants and animals.Global warming is an increase in the overall temperature of the earth's atmosphere. It's generally attributed to the greenhouse effect caused by increased levels of carbon dioxide and other gases.