Monday, April 22, 2013

Earth Day 2013: Climate Change

Over the past 100 years human activity has led to an increase in earth's average surface temperature. Scientists have measured the increase to be three-quarters of a degree celsius.

The global warming is caused by an increase in greenhouse gases like carbon dioxide. The extra CO2 enters the atmosphere. Then the CO2 acts like glass in a greenhouse. The suns rays pass through the atmosphere then when reflected heat energy tries to escape it gets trapped making earth warmer. This process is called the greenhouse effect.

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