Definition of the global warming and some evidence

The global warming is defined as an increase in the temperature which is caused by the increase of the greenhouse gases as a result of the pollution. The climate begin to change incredibly and we misunderstanding the system of the world’s climate. However, scientists now find an evidence that shows the global warming occurring. The evidence comes from the measurement of the increasing in the air temperatures and ocean temperatures such as the increase in the global sea levels. It changes the physical and biological systems. This warming has already changed the world’s climate. Some other evidences of the global warming are the carbon dioxide increasing in the atmosphere, Methane also increasing, Melting Arctic sea ice and oceans warming. Some scientists think that the Katrina hurricane and tsunami are evidence of the global warming.