so we have a 2—stage process. in the first stage, we blow air through. co2 sticks on the material, they are purified air — so air without co2 or with very little co2 — leaves the box. when the filter�*s full, we close the door and start heating. we heat up the collector up to 100 degrees, co2 is released and we take it out. once the filters are cleaned, the carbon capture can start all over again. perhaps one of the best technologies at solving the carbon problem is nature itself. i've come to brynau wood in south wales, one the last patches of a once enormous ancient woodland. today, a reforestation project is under way.