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<a accesskey="1" href="page.php?w=climate_system&amp;p=3">1.Previous</a><br />
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<p>forcings can be natural, such as <a href="page.php?w=Solar_activity_and_climate">variations in solar intensity</a> and volcanic eruptions, or caused by humans. Accumulation of <a href="page.php?w=greenhouse_gas">greenhouse gas</a>es in the atmosphere, mainly being emitted by people burning <a href="page.php?w=fossil_fuel">fossil fuel</a>s, is causing <a href="page.php?w=climate_change">climate change</a>. Human activity also releases cooling <a href="page.php?w=aerosols">aerosols</a>, but their net effect is far less than that of greenhouse gases.</p><p>
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