According to the United Nations, Planting forests bigger than the size of Hong Kong can help tackle climate change. And they have finally announced plans to plant forests in Asian and African cities to help make them greener.
Studies tell us that planting trees is "the best climate change solution available today", although not everyone agrees with that specific claim.
By 2050, the proportion of people living in cities could increase by almost 70% - mainly in Africa and Asia, which could cause damaging environmental impacts if there is no proper planning. The UN Food and Agriculture Organization (FAO) says the initial plan is to increase the amount of green space in 90 cities in 30 African and Asian countries - a total of up to 500,000 hectares of new urban forests.
Here are some key projects:
The Great Green Wall
A 8,000 km wall of trees is being built in Africa - making it the largest living structure on the planet once it's finished.
The 10 Billion Tree Tsunami
In August 2017, way ahead of schedule, Pakistan hit its target of planting a billion trees. So in 2018, they gave themselves a new target - planting 10 billion trees in the next five years.
India's tree boom
Under the Paris Climate Agreement, India has pledged to increase its forests by a massive 95 million hectares by 2030.
The UK's planting too
The Woodland Trust - the UK's leading woodland conservation charity - is aiming to plant 64 million trees in the next 10 years. To meet its aim, it's giving away hundreds of thousands of trees for free to schools and communities to encourage tree planting.
There are even drones planting
In Myanmar, there are now drones planting trees. The drone flies over the land, picks the best location and then fires a pod filled with seeds into the ground.
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