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In April 19, 2019, there was a public debating event called "Happiness: Capitalism vs. Marxism" featuring Canadian psychologist Jordan B. Peterson and psychoanalytical philosopher Slavoj Žižek as the two speakers. During this so-called "debate of the century", Peterson (1:55:32 in the video of the event) reiterates an argument made earlier by Žižek that there were more forests now in the Northern Hemisphere than 100 years ago.

Is this claim correct?

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There are several news reports 1, 2, 3, which are all mentioning this study, that is unfortunately not open-source. The findings were

The research suggests an area covering 2.24 million square kilometers - roughly the combined land surface of Texas and Alaska, two sizeable US states - has been added to global tree cover since 1982.

But it is also mentioned, while the northern hemisphere has more trees, south America has lost a lot and the diversity of the trees went down.

South America Tree loss Image Reference


I know this is not a hundred years ago, but only 35 years. Given the fact that he held a speech and the claim sounds very similar (only time is offset, but on the same scale) and he retweeted a similar news story, were the claim was

“Deforestation has stopped in wealthy countries. Europe’s forest area grew by more than 0.3% annually from 1990 to 2015. In the United States it is growing by 0.1% annually.”

I am pretty certain he didn't mean exactly a hundred years ago.

  • Wow. Thank you. Is it true that most people live in Northern hemisphere? – SSimon Apr 20 at 15:59
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    Unfortunately, the time span that is covered by the article you refer to is too short to address the claim asked in the question. The 1980s were a time in which the impact and the dangers of deforestation became very visible. It's not surprising that we see an absolute increase since then. But what about the preceding 65 years, a period in which environmentalism was not exactly well-developed? What if the absolute loss of forested areas during that time in the Northern Hemisphere was much larger than the gain since 1982? – Schmuddi Apr 20 at 16:08
  • @SSimon Yes. But that isn't really relevant since this is a global issue: oxygen is a gas and difuses freely across the entire planet, so you can't make a useful breakdown by hemisphere. – terdon Apr 20 at 16:40
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    I don't understand the labeling in that figure. Is the net gain for e.g. Europe larger than the gross gain? – Anyon Apr 20 at 20:40
  • @Anyon It is written net change not net gain. That means the positive and the negative gain (total change). The net gain is the positive surplus – Maxim Apr 21 at 8:03

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