Proforestation
The great forests that have long existed on the Earth draw in huge amounts of carbon from the atmosphere. Proforestation is protecting the forests there still are, encouraging them to continue to heal and grow.
Coal
Coal is a combustible brownish-black sedimentary rock. It is an unsustainable source of power because it is a finite resource, and burning it releases greenhouse gasses and air pollutants, causing environmental harm and health risks.