Hacker Cinema
Greening the Desert
2007 · Film · documentary · 6 min
Permaculture expert Geoff Lawton describes how he and a team of volunteers grew an oasis in arid, salty lowland, despite extremely high temperatures and minimal irrigation. The site is the lowest dryland expanse on Earth: a plain in Jordan, two kilometres northeast of the Dead Sea, and 400 metres below sea level.
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>You don't mention that trees also regulate the local microclimate; they tend to make rain, for example.
Good point. I'm usually so eager to mention that, too!
Trees regulate not only the microclimate, but the macroclimate as well. Isotopic analysis shows that about 80% of all terrestrial rainfall is caused by transpiration from trees and other plants. Trees essentially act as a giant inland irrigation network, using solar power to transport water via the airstream to power the water cycle. https://www.nature.com/articles/nature11983
So trees cause rain. This explains why deforestation causes desertification. I would also recommend the excellent Greening the Desert documentary for an example of the reverse process. https://www.youtube.com/watch?v=2xcZS7arcgk