Their number one rule is to 'protect existing forests first' because old trees are more resilient and better at soaking up carbon.
Another rule is putting local people at the heart of tree planting as they are the ones who'll benefit – so they'll be more invested in making sure seeds take root. Maintaining biodiversity is also one of their key maxims.
There are some bold tree planting initiatives all round the world. China plans to plant 35 million hectares of trees in the north of the country by 2050, while banks and nations recently pledged more than $14 billion to accelerate a 'great green wall' across Africa.
But the reality is deforestation is happening at pace. Forests are called the lungs of the earth and scientists say we have to do more to keep them breathing, with scientists at Kew describing this decade as crucial for reforesting the earth.