What struck me in the article was the description of re-vegetation from farmed species. I was just checking out the last 100 years of aerial photography here in

What struck me in the article was the description of re-vegetation from farmed species. I was just checking out the last 100 years of aerial photography here in Sydney and it was frankly shocking how much things have changed and reverted over time. Original forest, then totally denuded, then dense vegetation, then back again over few decades. In a tropical area such as the Amazon I'm sure that you could see a totally cleared area reclaimed by jungle at rates exceeding a meter a month, even a meter a week! One can really appreciate that they didn't build in stone for fun ... anything else would have disappeared the moment they took a break from weeding.