"Carbon Sciences believe they have made a breakthrough with their technology, which they say can transform CO2 back into basic fuel building blocks efficiently.
Their biocatalytic process converts CO2 into basic hydrocarbons - C1 (methane) C2 (ethane) and C3 (propane) -- which can then be utilized to make higher-grade fuels like gasoline and jet fuel."
As we've been saying, there are ways to make the by-products of coal use - especially those from CTL conversion processes - valuable as raw materials for other processes.
Another excerpt, concerning one of our own, respected, national laboratories:
"Scientists at Sandia National Laboratories in New Mexico are exploring the idea of using concentrated solar energy to turn CO2 into fuel. The Sunshine to Petrol project is testing a prototype device called the Counter Rotating Ring Receiver Reactor Recuperator (called CR5 for short) which turns CO2 into carbon monoxide which could then form part of a liquid fuel."
So, whether or not humans or volcanoes contribute more CO2 to the environment, we don't have to dump any more than we are right now in order to continue using coal, and to broaden it's use as a feedstock for liquid fuel conversion and chemical manufacture.
We can, and should, capture and use the Carbon Dioxide.