There is enough room in the world’s existing parks, forests, and abandoned land to plant 1.2 trillion additional trees, which would have the CO2 storage capacity to cancel out a decade of carbon dioxide emissions, according to a new analysis by ecologist Thomas Crowther and colleagues at ETH Zurich, a Swiss university.
The research, presented at this year’s American Association for the Advancement of Science conference in Washington, D.C., argues that planting additional trees is one of the most effective ways to reduce greenhouse gases.
Trees are “our most powerful weapon in the fight against climate change,” Crowther told The Independent. Combining forest inventory data from 1.2 million locations around the world and satellite images, the scientists estimate there are 3 trillion trees on Earth — seven times more than previous estimates. But they also found that there is abundant space to restore millions of acres of additional forests, not counting urban and agricultural land.
Where will we find the area for all those trees?
• 1.2 trillion trees = 1.2 * 1012 trees
• If we plant these at 10 m x 10 m (that is dense for large trees) = 10000 trees/km² ( or 100 trees/ha);
• So we need 1.2 * 1012 / 104 km² = 1.2 × 108 km² of land;
• The whole planet earth is 5.1 × 108 km², of which 3.4 × 108 km² is ocean/sea;
• So of the 1.7 × 108 km² of land, we will need 1.2 × 108 km² for planting these additional trees, that is 71% of all land … (where shal we live? what about the existing forest? marshes, … ?)