definition of global warming and evidence

The increase in the average temperature of the earth's atmosphere. The human activity effect to this change through the increase of heat trapping greenhouse gases. Over time, this increase may be enough to cause climatic change, including raising sea levels, altering precipitation patterns and changing water supplies and crop yields. Global warming could also affect human health, harm wildlife. The evidence of the global warming is that the increase of carbon dioxide in earth measured by the science and Levels of atmospheric methane, powerful greenhouse gas .another evidence is that poles are melting because of the increase of the earth temperature. The measurement done by the scientist’s show that temperature is raising and the sea level also more than it was in the past. The change in the weather that cusses a lot of disaster is clear evidence of global warming.