One method for removing carbon dioxide from the atmosphere that is often mentioned is the planting of millions of trees, which help soak up CO2 as they grow, trapping it in the tree instead of allowing it to remain in the atmosphere. While planting of trees has many benefits to CO2, cooling cities, and improving green space, it is not as much of a solution as you might think. Studies have shown that planting the wrong kind of trees, especially monocultures without biodiversity, are not good for restoring native ecosystems. Plus planting trees in high latitudes can sometimes effectively warm the climate instead of cooling it by altering the local energy balance. You can read more at Bloomberg Green here.