Matthias,Supercritical CO2 working fluid looks real. Lots of research for use in connection with solar thermal and nuclear heat. The Texas project mentioned in Forbes is the nearest commercial-scale test appearing in the news for the past couple years. Note that combustion of methane produces a
Dear colleagues,
A pair of recent articles for your perusal, on the use of scenarios and
foresight methods for exploring perspectives and anticipating issues on the
means, ends and governance of (solar) geoengineering.
*1) "Engineering imaginaries: Anticipatory foresight for SRM governance"
