It was recently revealed that young trees can absorb carbon dioxide better than established tropical rainforests, which seemed to be a dose of good news in the battle against global warming.
But studies have revealed that there is so much carbon dioxide in the atmosphere that solely planting trees won't be enough to save humans.
And that's because there just isn't enough space on earth to plant the amount of trees that would be required to make a real dent in our carbon emissions.
It has been calculated that if we planted 1.7 billion acres of trees, we could remove 3 billion tons of atmospheric carbon a year, according to Business Insider.
That's about 10 percent of what humans emit every year, which can total up to 40 billion tons.
Scientists have looked at trees as a potential solution because they remove carbon dioxide from the atmosphere during photosynthesis, using it to form carbohydrates that are used in plant structure and function. Trees also release oxygen back into the atmosphere as a byproduct.
But 1.7 billion acres of trees would be equivalent to the entire contiguous US.
And planting that many trees would cover half the land that is used to farm crops worldwide, plus land we would need to eventually farm as populations continue to grow.
Thus, studies have found that this solution could actually lead to starvation of the human population.
Planting trees clearly isn't going to be the sole solution to global warming, but it can still help.
Researchers at the University of Birmingham recently discovered that trees less than 140 years old are responsible for purging Earth of more than half of the atmosphere's carbon dioxide.
Study author Dr Tom Pugh, of the Birmingham Institute of Forest Research (BIFoR), said a young forest could absorb up to 25 percent more carbon than an older one.
The research highlights how much carbon dioxide can be absorbed by growing forests in the future.
Pugh said the age of the trees was important to take into account when calculating how much carbon a forest will absorb after reforestation schemes.
'It's important to get a clear sense of where and why this carbon uptake is happening, because this helps us to make targeted and informed decisions about forest management,' he said.
'The amount of CO2 that can be taken up by forests is a finite amount: ultimately reforestation programs will only be effective if we simultaneously work to reduce our emissions.'