Are you talking about

A scalable self replicating and self sustaining carbon capture technology that uses a mix of highly specialized biological processes to turn CO2 into engineering grade composite construction material, fuel and fertilizer.

?

You could theoretically build a coal pit in your back yard to turn the wood into coal, then power a steam engine hooked to generators to make electricity to run your computer. If you wanna be super "efficient" you can route the gasses from the coal process through the steam engine too to get power from that as well

Probably cleaner and less work to do almost any other kind of power though