Plants could also hit the amounts required. If worldwide, 10% of all farmland was used to grow bamboo, you'd be able to harvest enough carbon each year to cover

Plants could also hit the amounts required. If worldwide, 10% of all farmland was used to grow bamboo, you'd be able to harvest enough carbon each year to cover the rest of the world's emissions. That's still a frighteningly large amount (really it's a frightening amount of agriculture that the world does) but given the supply chains that already exist for agriculture it's believable that it could be turned into a carbon sequestering supply chain.