Tropical forests can bounce back with surprising rapidity, a new study published today suggests. An international group of researchers looking at a number of aspects of tropical forests has found that the potential for regrowth is substantial if they are left untouched by humans for about 20 years. For example, soil takes an average of 10 years to recover its previous status, plant community and animal biodiversity take 60 years, and overall biomass takes a total of 120, according to their calculations." This is due in part to a multidimensional mechanism whereby old forest flora and fauna help a new generation of forest grow " a natural process known as "secondary succession". These new findings ... suggest that it is not too late to undo the damage that humanity has done through catastrophic climate change over the last few decades. "That's good news, because the implication is that, 20 years ... that's a realistic time that I can think of, and that my daughter can think of, and that the policymakers can think of," said Lourens Poorter ... lead author of the paper. This idea of natural regeneration is frequently disregarded in favour of tree plantations, but according to Poorter, the former yields better results than restoration plantings. "Compared to planting new trees, it performs way better in terms of biodiversity, climate change mitigation and recovering nutrients." The takeaway message is that we don't necessarily need to plant more trees when nature is doing it by itself, Poorter said.