Climate change is a significant and lasting change in the statistical distribution of weather patterns over periods ranging from decades to millions of years.
It may be a change in average weather conditions, or in the distribution of weather around the average conditions. Climate change is caused by factors such as biotic processes, variation in solar radiation receive by earth, plate tectonics, and volcanic eruptions. Certain human activities have also been identified as significant causes of recent climate change, often referred to as "Global Warming".
Climate change is a change in ther statistical properties of the climate system when considered over long periods of time, regardless of cause. it is a global problem. The impact of it is tremendous risk to the security and well-being of our country. Global climate change has already had observable effect on the environment.
We are the reasons why we are encountering lots of troubles or always give us problems. It is a terrible problem, and it absolutely needs to be solved.
Reference: http://en.wikipedia.org/wiki/climate_change
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