Simplistically, plants use carbon dioxide for photosynthesis, create hydrocarbons and expel oxygen. Animals use oxygen and expel carbon dioxide. There are many other organisms and mechanisms that produce greenhouse gases. In fact, most plants respire and produce carbon dioxide during the night while laying down new roots. So the carbon cycle should be steady state. The problem with fossil fuels is we’re releasing carbon that was stored thousands of years ago. There is a measurable increase of atmospheric CO2 which will not dissipate easily.
The goal of Carbon Block is to create new carbon sinks that will sequester more carbon than it will expel.
carbon block - Fix Global Warming 