“Researchers estimated that under the current climate conditions, Earth’s land could support 4.4 billion hectares of constant tree cover. That’s 1.6 billion more than the existing 2.8 billion hectares. Of those 1.6 billion hectares, 0.9 billion hectares fulfill the criterion of not being used by humans. That means that there is currently an area of the size of the United States available for tree restoration. Once mature, those new forests could store 205 billion tonnes of carbon: approximately two-thirds of the 300 billion tonnes of carbon which has been released into the atmosphere as a result of human activity since the Industrial Revolution”.