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<a accesskey="3" href="page.php?w=methane_emissions&amp;p=2">3.Next</a>
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<p>Increasing <b>methane emissions</b> are a major contributor to the rising concentration of <a href="page.php?w=greenhouse_gas">greenhouse gas</a>es in <a href="page.php?w=Earth%27s_atmosphere">Earth's atmosphere</a>, and are responsible for up to one-third of near-term <a href="page.php?w=global_heating">global heating</a>. During 2019, about 60% (360 million tons) of <a href="page.php?w=methane">methane</a> released globally was from human activities, while natural sources contributed about 40% (230 million tons).</p><p>
<a accesskey="3" href="page.php?w=methane_emissions&amp;p=2">3.Next</a>
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