News for hackers. Stuff that matters.

A comment on Robotic 'trees' can turn CO2 into concrete. Parent comment

Re:Robotic 'trees' can turn CO2 into concrete by Symmetry on Tuesday September 11, 2018 @08:03AM (#17958911)
Well, according to Energy and Civilization forest stores an average of 1 watt per square meter in burnable wood. Wood burning is pretty carbon intensive as energy goes so I imagine that each square meter of forest, if the fallen trees are buried deep underground, could offset several watts of internal combustion engine use.
[ Parent | on HN ]
Re:Robotic 'trees' can turn CO2 into concrete by 08-15 on Tuesday September 11, 2018 @12:27PM (#17961167)
Nope. The energy density of gasoline and wood per carbon atom is about the same. So a watt is a watt, and forest are inefficient (about 0.4%) at converting sunlight into chemical energy.
[ Parent | on HN ]