On: Robotic 'trees' can turn CO2 into concrete

[ForHackernews]

The trees will die eventually. The problem is that we've released a lot of CO2 from trees that died millions of years ago.[0]

If you want to get that out of the atmosphere, it's not good enough to grow trees today because in 50-100 years (or whenever a tree dies) you're right back where we are today.

[0] https://www.nationalgeographic.com/science/phenomena/2016/01...

[gascan → ForHackernews]

The tree which dies is replaced by a new tree.

You're right that we've added more carbon than can be stored in living forests. But reversing deforestation can & should be part of the solution.