[boxcardavin]

I've done this math before and it's not encouraging. Global carbon fuel burning is more than two cubic miles annually. A billion trees will capture about a trillion kgs of carbon over 10-20 years, but yearly we're burning about 4 trillion kgs of just crude oil.

[tsar_nikolai]

1B hectares of trees supports approx. 1T trees. As with everything, it will not be the solution to climate change and has to live alongside other measures. But it is one of the cheapest (in terms of money) and least radical (in terms of lifestyle adaption) measures we can take for the effect it will have. This study shows that the earth has enough space. It will require a shift in priority for many governments (e.g. Brasil) though.

[ssijak]

1B hectares od trees is much different than 1B trees

[goatlover]

Up to 2500 hundred trees can be planted in a hectare. Which is over a trillion trees. I think that coincides with an article on planting a few trillion trees to offset climate change.

[geogra4]

Each human being on this planet just needs to plant about 140 trees - to give a sense of the scale of this number

[etrautmann]

On face value that sounds absurd, though in reality seed distribution may be automated and scaled in a feasible manner. Certainly the number of corn plans planted in the US alone must be an astonishing number if calculated per capita.