Start at 9:02. Horses selectively trample bare ground, not the grasses they eat. Seeds in their dung germinate better after traveling through their gut, essentially providing a 11:20 "self-watering, pre-fertilized seed packet." Nitrogen levels rose, insects, then birds, and then predators started to return.
21:25 China had planted 66 billion trees in a failed attempt to thwart desertification, but 21:58 grasslands require 90% less water than trees.
By 2023, a desert that was 23:27 expanding by thousands of km² per year was now shrinking by 47 km² per year.
