Tree planting is no quick climate fix. It can take 30 to 40 years of growth for the carbon storage to reach its full potential. A more immediate benefit can come from halting deforestation,  which costs our planet around 15 billion trees each year.

But although tree planting on such a colossal scale faces significant challenges (not least identifying who owns the land in question, and securing the rights to plant and maintain trees there), widespread efforts are already underway. The Australian government has announced it will plant 1 billion trees by 2030; work is underway on a “Great Green Wall” to stop the spread of the Sahara by restoring 100 million hectares of degraded land (and sequester 250 million tons of carbon), and China’s anti-desertification program, also known as the “Great Green Wall,” has planted more than 50 billion trees since the 1970s. The UN-endorsed Bonn Challenge aims to reforest 350 million hectares of degraded land globally by 2030.