Royal Society to research potential of geo-engineering to limit global warming

Science academy to launch a feasibility study to establish which techniques might best tackle climate change
Alok Jha, green technology correspondent
guardian.co.uk,
Thursday October 30 2008 00.01 GMT

The Royal Society has announced plans today to study which planetary-scale geo-engineering techniques might play a practical role in stemming the worst impacts of climate change.
Geo-engineering includes everything from placing mirrors in space that reflect sunlight from the Earth to seeding the oceans with iron to encourage the growth of algae that can soak up atmospheric carbon dioxide. The Royal Society study will look at which techniques might be feasible to carry out and what their impacts or unintended consequences might be on society.
"Some of these proposals seem fantastical, and may prove to be so. Our study aims to separate the science from the science fiction and offer recommendations on which options deserve serious consideration," said John Shepherd, an oceanographer at Southampton University, and chair of the Royal Society working group that will carry out the study. "We need to investigate if any of these schemes could help us avoid the most dangerous changes to our climate and to fully understand what other impacts they may have."
In September, the Royal Society published a special edition of its journal, Philosophical Transactions, dedicated to geo-engineering. In their introduction to the papers in that edition, Brian Launder of the University of Manchester and Michael Thompson of the University of Cambridge wrote: "While such geo-scale interventions may be risky, the time may well come when they are accepted as less risky than doing nothing. There is increasingly the sense that governments are failing to come to grips with the urgency of setting in place measures that will assuredly lead to our planet reaching a safe equilibrium."
In the papers, experts said that a reluctance "at virtually all levels" to address rising greenhouse gas emissions meant carbon dioxide levels in the atmosphere were on track to pass 650 parts per million (ppm), which could bring an average global temperature rise of 4C. They called for more research on geo-engineering options to cool the Earth.
But not everyone is convinced of the need for such radical techniques to halt climate change. Greenpeace chief scientist Doug Parr said: "The wider point is not the pros and cons of particular technologies, but that the scientific community is becoming so scared of our collective inability to tackle climate emissions that such outlandish schemes are being considered for serious study. We already have the technology and know-how to make dramatic cuts in global emissions - but it's not happening, and those closest to the climate science are coming near to pressing the panic button."
Shepherd said that, whatever his study finds, the world cannot ignore the need to cut carbon emissions anyway. "Whatever solutions technology may offer us in the future, it's clear that the need to cut emissions of greenhouse gases into the atmosphere is now more urgent than ever."
The working group's report is expected to be published next year.