Climate change is any substantial change in Earth’s climate that lasts for an extended period of time. Global warming is an observed increase in the average temperature of the Earth's atmosphere and oceans. Part of this increase may be due to natural processes, and would have occurred independently of human activity. It is also one of the biggest problems facing the world today. Many scientists believe that our production of carbon dioxide and other greenhouse gases has a heating effect on the atmosphere, and this could be very dangerous for human life. A rise in the temperature may lead to changes in rainfall patterns, a rise in sea level, and a wide range of impacts on plants, wildlife, and humans. When scientists talk about the issue of climate change, their concern is about global warming caused by human activities.
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