<story><title>&quot;Amazonian dark earth&quot; was the work of ancient humans</title><url>https://www.bbc.com/future/article/20240116-the-dark-earth-revealing-the-amazons-secrets</url></story><parent_chain></parent_chain><comment><author>felipeerias</author><text>Ruins of ancient cities have been found on different sites in the Amazon. For example:&lt;p&gt;&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;Kuhikugu&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;Kuhikugu&lt;/a&gt;&lt;p&gt;&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;Marajoara_culture&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;Marajoara_culture&lt;/a&gt;&lt;p&gt;We often assume that the Amazon tribes have remained unchanged since the dawn of time, but at least some of them are likely to be survivors of urban collapse.</text></comment>
<story><title>&quot;Amazonian dark earth&quot; was the work of ancient humans</title><url>https://www.bbc.com/future/article/20240116-the-dark-earth-revealing-the-amazons-secrets</url></story><parent_chain></parent_chain><comment><author>Jedd</author><text>Phrasing like &amp;#x27;Now businesses are attempting to capitalise on this ancient method ...&amp;#x27; is true, but as others here have noted, this is not a new area of research, or a new area of business.&lt;p&gt;Can recommend &amp;quot;Burn - Using Fire to Cool the Earth&amp;quot; (2019) by Albert Bates &amp;amp; Kathleen Draper- which looks at various, often surprising, uses for biochar.&lt;p&gt;&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;www.goodreads.com&amp;#x2F;en&amp;#x2F;book&amp;#x2F;show&amp;#x2F;43866589&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;www.goodreads.com&amp;#x2F;en&amp;#x2F;book&amp;#x2F;show&amp;#x2F;43866589&lt;/a&gt;</text></comment>