The best of EcoWatch, right in your inbox. Sign up for our email newsletter!
Geoengineering Could Create More Problems Than It Could Solve
By Tim Radford
Geoengineering—the untested technofix that would permit the continued use of fossil fuels—could create more problems than it could solve.
By masking sunlight with injections of sulphate aerosols in the stratosphere, nations could perhaps suppress some of the devastating hurricanes and typhoons that in a rapidly warming world threaten northern hemisphere cities. But they could also scorch the Sahel region of Africa, to threaten millions of lives and livelihoods, according to new research.
Geoengineering is sometimes played as humanity's have-your-cake-and-eat-it-too option: humans have already unthinkingly engineered climate change over the last 200 years by profligate combustion of coal, oil and gas that releases ever-growing concentrations of the greenhouse gas carbon dioxide into the atmosphere.
Since ferocious volcanic eruptions have been known to cool the global climate by pumping soot and sulphur dioxide into the upper atmosphere, some reason that scientists and technologists could play the same card, in a calculated fashion.
But shortly after one research team showed that, in theory at least, geoengineering could be made to work, a second group has demonstrated that there would be a huge price to pay. And they call on policymakers to think carefully before testing any unilateral action.
"Our results confirm that regional solar geoengineering is a highly risky strategy which could simultaneously benefit one region to the detriment of another," said Anthony Jones, a climate scientist at the University of Exeter, UK, who led the study.
"It is vital that policymakers take solar geoengineering seriously and act swiftly to install effective regulation."
This is an argument that has continued for more than a decade: in 2006, the Nobel laureate and chemist Paul Crutzen pointed out that, while burning hydrocarbon fuels, humans also released sulphate aerosols that represented a health hazard, linked to half a million deaths a year.
If a proportion of this pollution reached the upper atmosphere, it would not only save lives, it would change the reflectivity of the planet, dim solar radiation and contain global warming.
Since then, researchers the world over have repeatedly looked at the geo-engineering option, and repeatedly conceded that the ideal answer would be to stop burning fossil fuels.
And since greenhouse gas emissions have failed to fall, other groups have repeatedly returned to the study, to find that such solutions may not work, or that they could create more problems than they solve.
Dr. Jones and his colleagues report in the journal Nature Communications that they tested the sulphate solution in simulation to find what others have suggested: that in addition to damping global temperature rise, a deliberate darkening of the skies would also suppress hurricane activity in the north Atlantic.
But, as others have argued, it would also heighten the likelihood of sustained drought in the Sahel, a region which extends across 14 nations in Africa, from Senegal to Ethiopia.
"It is obvious from first principles that stratospheric aerosol geoengineering deployed in only one hemisphere would lead to huge shifts in tropical climate patterns," said Peter Irvine, a researcher at Harvard University in the U.S., commenting on the study.
"Deploying stratospheric aerosol geoengineering in only one hemisphere is pretty certainly a bad idea, and this work helps reinforce that view."
And John Shepherd, an Earth system scientist at the University of Southampton in the UK, said: "This is not a technique that is ready to use in the near future: reducing CO2 emissions and planning our adaptation must remain top priorities for climate policy."
Reposted with permission from our media associate Climate News Network.
EcoWatch Daily Newsletter
Teen activist Greta Thunberg delivered a talking-to to members of Congress Tuesday during a meeting of the Senate Climate Change Task Force after politicians praised her and other youth activists for their efforts and asked their advice on how to fight climate change.
The University of California system will dump all of its investments from fossil fuels, as the Associated Press reported. The university system controls over $84 billion between its pension fund and its endowment. However, the announcement about its investments is not aimed to please activists.
By Ngozi Okonjo-Iweala
World leaders have a formidable task: setting a course to save our future. The extreme weather made more frequent and severe by climate change is here. This spring, devastating cyclones impacted 3 million people in Mozambique, Malawi and Zimbabwe. Record heatwaves are hitting Europe and other regions — this July was the hottest month in modern record globally. Much of India is again suffering severe drought.
By Mark Hertsgaard
The United Nations Secretary General says that he is counting on public pressure to compel governments to take much stronger action against what he calls the climate change "emergency."
A unique subpopulation of ancient walrus in Iceland was likely hunted to extinction by Vikings shortly after arrival to the region, according to new research.