Statistic of the decade: The massive deforestation of the Amazon

. Dec 31, 2019
Aerial view of deforested area of the Amazon rainforest Aerial view of deforested area of the Amazon rainforest. Photo: Paralaxis/Shutterstock

This year, I was on the judging panel for the Royal Statistical Society’s International Statistic of the Decade. Much like the Oxford English Dictionary’s “Word of the Year” competition, the international statistic is meant to capture the zeitgeist of this decade. The judging panel accepted nominations from the statistical community and the public at large for a statistic that shines a light on the decade’s most pressing issues. On December 23, we announced the winner: the 8.4 million soccer fields of land deforested in the Amazon over the past decade. That’s 24,000 square miles, or about 10.3 million American football fields.

</p> <div class="flourish-embed" data-src="visualisation/1169387"></div><script src=""></script> <p>This statistic, while giving only a snapshot of the issue, provides insight into the&nbsp;<a href="">dramatic change to this landscape</a>&nbsp;over the last 10 years. Since 2010, mile upon mile of rainforest has been replaced with a wide range of commercial developments,&nbsp;<a href="">including cattle ranching, logging and the palm oil industry</a>.</p> <p>This calculation by the committee is based on&nbsp;<a href="">deforestation monitoring</a>&nbsp;results from Brazil’s National Institute for Space Research, as well as&nbsp;<a href="">FIFA’s regulations</a>&nbsp;on soccer pitch dimensions.</p> <h2>Calculating the cost</h2> <p>There are a number of reasons why this <a href="">deforestation</a> matters – financial, environmental and social.</p> <p>First of all,&nbsp;<a href="">20 million to</a>&nbsp;<a href="">30 million people live in</a>&nbsp;the Amazon rainforest and depend on it for survival. It’s also the home to&nbsp;<a href="">thousands of species of plants and animals</a>, many at risk of extinction.</p> <p>Second,&nbsp;<a href="">one-fifth of the world’s fresh water</a>&nbsp;is in the Amazon Basin, supplying water to the world by releasing water vapor into the atmosphere that&nbsp;<a href="">can travel</a>&nbsp;thousands of miles. But unprecedented droughts have plagued Brazil this decade,&nbsp;<a href="">attributed to the deforestation</a>&nbsp;of the Amazon.</p> <p><a href="">During the droughts</a>, in São Paulo state, some farmers say they lost over one-third of their crops due to the water shortage. The government promised the coffee industry almost USD 300 million to help with their losses.</p> <p>Finally, the Amazon rainforest is responsible for storing over&nbsp;<a href="">180 billion tons</a>&nbsp;of carbon alone. When trees are cleared or burned,&nbsp;<a href="">that carbon is released</a>&nbsp;back into the atmosphere. Studies show that&nbsp;<a href="">the social cost of carbon emissions is about USD 417 per ton</a>.</p> <p>Finally, as&nbsp;<a href="">a November 2018 study shows</a>, the Amazon&nbsp;<a href="">could generate</a>&nbsp;over USD 8 billion each year if just left alone, from sustainable industries including nut farming and rubber, as well as the environmental effects.</p> <h2>Financial gain?</h2> <p>Some might argue that there has been a financial gain from deforestation and that it really&nbsp;<a href="">isn’t a bad</a>&nbsp;thing. Brazil’s president, Jair Bolsonaro, went so far as to say that saving the Amazon is an&nbsp;<a href="">impediment to economic growth</a>&nbsp;and that “where there is indigenous land, there is wealth underneath it.”</p> <p>In an effort to be just as thoughtful in that sense, let’s take a look. Assume each acre of rainforest converted into farmland is worth about USD 1,000, which is&nbsp;<a href="">about what U.S. farmers have paid</a>&nbsp;to buy productive farmland in Brazil. Then, over the past decade, that farmland amounts to about USD 1 billion.</p> <p>The deforested land&nbsp;<a href="">mainly contributes</a>&nbsp;to cattle raising for slaughter and sale. There are a little over 200 million&nbsp;<a href="">cattle in Brazil</a>. Assuming the&nbsp;<a href="">two cows per acre</a>, the extra land means a gain of about USD 20 billion for Brazil.</p> <p>Chump change compared to the economic loss from deforestation. The farmers, commercial interest groups and others looking for cheap land all have a clear vested interest in deforestation going ahead, but any possible short-term gain is clearly&nbsp;<a href="">outweighed by long-term loss</a>.</p> <h2>Rebounding</h2> <p>Right now,&nbsp;<a href="">every minute</a>, over three football fields of Amazon rainforest are&nbsp;<a href="">being lost</a>.</p> <p>What if someone wanted to replant the lost rainforest? Many charity organizations are raising money to do just that.</p> <p>At the cost of over&nbsp;<a href="">USD 2,000 per acre</a>&nbsp;– and that is the cheapest I could find – it isn’t cheap, totaling over USD 30 billion to replace what the Amazon lost this decade. Still, the studies that I’ve seen and my calculations suggest that trillions have been lost due to deforestation over the past decade alone.</p> <hr class="wp-block-separator"/> <div class="wp-block-image"><figure class="alignleft"><img loading="lazy" width="300" height="24" src="" alt="the conversation brazil article" class="wp-image-398" srcset=" 300w, 768w, 1024w, 2000w" sizes="(max-width: 300px) 100vw, 300px" /></figure></div> <h6 style="text-align:right">Originally published on<br><a href=""><strong>The Conversation</strong></a></h6> <img loading="lazy" src="" alt="The Conversation" width="1" height="1" style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important; text-shadow: none !important"> <p>

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Liberty Vittert

Professor of the Practice of Data Science, Washington University in St. Louis.

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