Global warming

Some people think that climate change is a gradual process will the passage of time. These views may be correct in some cases, but in recent years we have reached to the highest temperature. Since the beginning of the year 1990, people have started to feel non-normal temperatures.
The oceans began to rise and the ice started melting and low-lying coastal areas are eroding, particularly in the summer and this affects the residents of the northern part of the land. All signs point to an abnormal increase of temperature, affected population, there have some organisms been studies by scientists and they discovered the global warming is the cause.
http://www.commondreams.org/views/070600-101.htm

The phenomenon of global warming has caused many environmental and health problems. The doctors in charge of studying the phenomenon of global warming discover the change of color of the water in some areas affected by global warming. In addition they found the change of hair color.

Comments
1. Global warming is caused by the emission of toxic gases which will affect the ozone layer.
2. We must reduce the emission of toxic gases to preserve the ozone layer.