Global warming

Global warming is the term used to describe a gradual increase in the average temperature of the earth's atmosphere and its oceans.
Global warming, also referred to as climate change is the observed century scale rise in the average temperature of the earth's climate system and it's effect. Global warming occurs when carbon dioxide and other air pollutants and green house gases collect in the atmosphere and absorb sunlight and solar radiation that have bounced off the earth's surface.
Global warming increase volumes of carbon dioxide and other greenhouse gases released by the burning of fossil fuels, land cleaning, agriculture and other human activities, are believed to be the primary sources of the global warming that has occurred many years ago.
Global warming has implications for our health. Rising temperatures will likely lead to increased air pollution, a longer and intense allergy season, the spread of insect borne diseases, more frequent and dangerous heat waves, and heavier rain storms and flooding. All these changes pose serious and costly risks to public health.