Carbon dioxide is captured using a box with a huge fan on one end and a filter inside that only attracts carbon dioxide. It's then heated to 100 degrees celsius, and pure carbon dioxide is released and collected. Different companies all around the world are doing it in different ways and storing the carbon in different manners. The i pc says that just getting us to zero is going to require something like ten to 20 billion tons of carbon being taken out of the atmosphere every single year in the second half of the century.