Global warming is the increase in the avarage temperature of the Earth with the increase of carbon dioxide, methane and other gases. Global warming is also known as the "Greenhouse effect”. Physics tell us that any object warmer than absolute zero will radiate energy. With the increasing average global temperature, the water in the oceans expands in volume. The sea level has risen more than 120 meters since the peak of the last ice age about 18,000 years ago. Also the temperature has increased by about 0.17 °C between the 1950s and the 1980s. Moreover, there are also some other effects, for example methane released from melting permafrost and peat bogs; forest fires which are caused, and this is happening because of the rising global temperature; the sea, which absorbs heat from the sun; and the role of carbon dioxide in the process of photosynthesis.
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