You have probably heard about the phrase “global warming” hundreds of times. But what exactly does global warming means? Global warming is not about having a hot day or week or month in one part of the world. It has to do with the average temperature worldwide. Simply put, global warming is the unusual rapid increase in earth’s average temperature worldwide. The warming of the earth began in the mid 1800’s. In the beginning it was small and very slow but then in the 1980’s the earth’s average temperature began to rise more rapidly and it has been climbing ever since. Overall earth’s temperature has risen 0.8°C (1.4°F) since about 1900. Scientists often use the term "climate change" instead of global warming. This is because as the Earth's average temperature climbs, winds and ocean currents move heat around the globe in ways that can cool some areas, warm others, and change the amount of rain and snow falling. As a result, the climate changes differently in different areas.
Scientists have spent decades figuring out the causes of global warming. They looked at the natural cycles and events that are known to influence the climate but they were not able to explain it alone. The only way they found to explain is to include greenhouse gases emitted by humans. They formed a group of scientists called IPCC or INTERNATIONAL PANEL on CLIMATE CHANGE. They meet up every few years to review the latest scientific finding and write a report summarizing all the facts that are known about global warming. The first thing they observed was there are several greenhouse gases that were responsible for warming and human emit them in a variety of ways. These gases include water vapor, nitrogen, methane and carbon dioxide. Most of these gases come from combustion of fossil fuels in cars, factories and electricity production. The gas responsible for most warming is carbon dioxide. Other contributors include methane from landfills and agriculture...
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