In other words, reducing carbon emissions around the world, creating clean energy from wind farms, driving electrical cars and so forth is not going to suffice to meet agreed upon climate targets at all. Negative emissions are needed. The world is going to overshoot the "maximum 2 degrees of warming" target completely unless someone figures out how to suck as much as 810 Billion Tonnes of carbon out of Earth's atmosphere by 2100 using some kind of industrial scale process that currently does not exist.
That breaks down to 1,785,742,000,000,000 pounds of CO2, "as much as the world's economy produces in 20 years," according to the Economist.
"Putting in place carbon-removal schemes of this magnitude would be an epic endeavour even if tried-and-tested techniques existed. They do not."