Answers

2014-12-15T14:23:41+05:30
Global warming and climate change both refer to the observed century-scale rise in the average temperature of the Earth's climate system and its related effects. Multiple lines of scientific evidence show that the climate system is warming. More than 90% of the additional energy stored in the climate system since 1970 has gone into ocean warming; the remainder has melted ice, and warmed the continents and atmosphere. The observed increases in global average surface temperature and atmospheric carbon dioxide have been much faster in recent decades than the natural changes of previous millennia, and levels are now higher than at any time for hundreds of thousands of years prior.
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2014-12-16T06:32:13+05:30

Global warming is a slow steady rise in Earth's surface temperature. Temperatures today are 0.74 °C (1.33 °F) higher than 150 years ago.

The basic cause seems to be a rise in atmospheric carbon dioxide, as predicted by Svante Arrhenius a hundred years ago. When people use fossil fuels like coal and oil, this adds carbon dioxide to the air. When people cut down the Earth's forests (deforestation), this means less carbon dioxide is taken out of the atmosphere by plants.

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