Atmospheric carbon per area is about 1 kg&#x2F;square meter. (x)<p>It&#x27;s not inconceivable that trees could store roughly similar orders of magnitude of carbon per area.<p><pre><code>  x: 0,3 * 5e18 * 400&#x2F;1e6 &#x2F; (7000000*7000000*4*3,14)</code></pre>