What’s powerful about the Salgados’ story is that it illustrates how quickly ecosystems can regenerate. The research on this is truly exciting. In 2016, an international team of scientists presented the biggest-ever database on forest regrowth in the New World tropics. They found that across ecosystems, from wet forest to dry forest, it takes an average of only sixty-six years for a forest to recover 90% of its old-growth biomass, completely naturally. All you have to do is leave it alone.