The Arbourist has a post about a small company that has a proposal to create liquid fuels out of water and carbon dioxide from the air. While the proposal looks promising, since, as far as I can tell, it takes more energy to create the liquid fuel than is released by burning that fuel, and that any carbon extracted from the atmosphere while creating the fuel will ultimately be re–emitted when that fuel is used, I have difficulty seeing how much of a difference this particular technology would make. (See also my comments at the Arbourist’s post). However, if new evidence or technology emerges that allows this technology to make more of a difference, I will certainly change my mind about it.
And The Arbourist’s post got me thinking. Since there has been much resistance to making more than a token effort to reduce greenhouse gas emissions, perhaps it is time to put geoengineering on the table. That might potentially be the best hope for avoiding disaster. While I am not actively suggesting we start geoengineering, I am suggesting we put it on the table. This is important considering our collective failure to make much effort towards mitigation of global warming and climate change.
Geoengineering is not science fiction. Several of the proposals have analogues that happen naturally. And it is not decades away. As far as I can tell, the following proposals are pretty much shovel ready, and we could start tomorrow if there was a serious effort, and with no significant research yet to be done or technology to be developed:
- Atmospheric sulphur aerosols
- Grassland restoration
- Cool roofs
- Enhanced weathering
These proposals each have a number of advantages and disadvantages (discussed after the jump):