If we burn biomass, then capture and bury the CO2 in the flue gas, we will reduce CO2 in the atmosphere.

Another way is to collect and bury the CO2 produced in fermentation of sugar to produce ethanol.

The process – called bio-energy with carbon capture and storage BECCS.

In theory, BECCS could extract between 3.0 and above 10 billion tonnes of carbon dioxide from the air a year



The most obvious way to capture CO2 is to let plants do it and collect the biomass produced.

If we used this method in Australia, then to collect the 1,300 MT of CO2 produced from burning the coal mined, we would need to cut down every mature tree every year and convert it to biochar to be buried underground.  That is the scale of the problem. 

Oxy-Burning biofuel with​ CCS

Also oxy-combustion

One idea is "carbon negative" power plants. The idea is to burn wood, capture the CO2, then bury it. This could actually reduce the amount of greenhouse gas in the air. 

Vattenfall, the Swedish energy giant that has built a pilot scale carbon-capture power station in Schwarze Pumpe, Germany. It burns the wood in pure oxygen producing pure CO2, ready for storage.