Proponents argue that geoengineering may be the only way of preventing climatic harms in the absence of substantial emissions reductions. But the consequences could be global, fatal, unintended and uncontrollable. Dr SAM ADELMAN investigates
To keep the world's coral reefs alive we may have to cool tropical seas by blocking the sun's rays above them, writes Tim Radford. Even if the world reduces carbon emissions, warming already 'in the pipeline' could kill 90% of the world's coral by 2050 unless we act.
The IPCC's 'Representative Concentration Pathways' are based on fantasy technology that must draw massive volumes of CO2 out of the atmosphere late this century, writes Nick Breeze - an unjustified hope that conceals a very bleak future for Earth, and humanity.
The geoengineering genie should remain firmly stopped up in its bottle until a robust case is made for letting it out, writes Clive Hamilton - and that's something the NRC's new report signally fails to achieve, providing no rationale for deploying the technology, or even experimenting with it.
Film maker Nick Breeze has conducted a series of interviews with experts on 'geo-engineering' to forestall runaway global warming. Here he presents the distilled wisdom from his meetings - and concludes that we should at least be experimenting with the techniques, and studying their impacts.