Around the world, people plan to plant more than 1 trillion trees this decade in an ambitious effort to slow climate change and reduce biodiversity loss. But if the past is prolonged, many of those planted trees won’t survive. And if they do, they could end up as biological deserts that lack the richness and resilience of healthy forests.
It doesn’t have to be this way.
The United Nations declared 2021–2030 the Decade on Ecosystem Restoration to encourage efforts to repair degraded ecosystems. Tree planting has become a centerpiece of that effort, championed by initiatives such as the Bonn Challenge and the Trillion Trees Campaign.
However, many tree-planting commitments have a critical flaw: They rely too heavily on monoculture plantations—vast areas planted with just a single tree species.
Monoculture plantations are generally one-way tickets to producing wood. But these high-yield plantations are high risk and can be surprisingly fragile. When drought, pests, or forest fires strike, entire monoculture plantations can fail at once. In one example, nearly 90% of 11 million saplings planted in Turkey died within three months due to drought and lack of maintenance.
Forests are more than just timber factories. They regulate water, store carbon, provide habitat for wildlife, cool the landscapes around them and even provide human health benefits.
