Yeah, woody perrenials lock up CO2 for centuries and we have a lot of abandoned mines and whatever holes are leftover from oil drilling that we could theoretically bury plant material in.
Still whatever we do would need to be on unprecedented scales and the World is just not going to do that. At least not until the effects are so acute that it is too late.
Yes, and this (“World is just not going to do that”) is very bad since things will get worse and many people may die (sooner than they would have) in the next 50, 100 years.
if you look at very long time scale, thousand years and more, things will balance up. (…?)
But we don’t really know : there might be big volcanoes or completely new technologies like Geo engineering. Of course the future is (mostly) unknown.
