US Government Begins Researching 'Climate Intervention' Geoengineering

Federal U.S. agencies (including the White House Office of Science and Technology Policy) have been asked to develop a five-year 'scientific assessment of solar and other rapid climate interventions.' As the Daily Beast sees it, the U.S. government is signalling that it's looking into 'one of the most controversial and consequential climate change-fighting tactics yet,' suggesting the report will look at a technique 'that essentially involves spraying fine aerosols into the atmosphere to reflect sunlight away from the Earth. The idea is that, once it's reflected, there'll be less heat and temperatures will go down.'

It seems like that's a subset of the 'solar and other rapid climate interventions' being mentioned in the federal document. But for what it's worth, here's an official statement from the American Meteorological Society on 'large-scale efforts to intentionally modify the climate system to counteract the consequences of increasing greenhouse gas concentrations.... now commonly referred to as climate intervention (also called geoengineering)...'

Proposals to intervene in the climate system generally fall into two broad categories: 1) actively removing CO2 (and possibly other greenhouse gases) from the atmosphere, known as carbon dioxide removal; 2) exerting a cooling influence on Earth by reflecting sunlight (known as solar radiation management) or altering thermal emissions to space by thinning cirrus clouds. These proposals differ widely in their potential to reduce impacts, create new risks, and redistribute risks among nations.

Techniques that remove CO2 directly from the air would confer global benefits by directly addressing the source of the climate problem. However, it may not be feasible to rapidly remove CO2 at a scale that will significantly limit warming. The effects of CO2 removal approaches are not fully understood and could create adverse local and global impacts. Reflecting sunlight would reduce Earth's average surface temperature but would not offset all aspects of climate change and would produce a different set of risks than those resulting from unmitigated warming.

The American Meteorological Society recommends an accelerated and robust climate intervention research program, and associated governance framework, to inform public policies. This should not include the development of deployment platforms but needs to include study of the feasibility of different deployment scenarios and strategies and how they would affect climate risk.... The desired outcome is for society to have the best possible information in hand to assess different options for reducing the risks of climate change and to decide if actions should include intentional climate intervention. Comprehensive Earth system model simulations will play a critical role in quantifying the regional to global impacts of different climate intervention approaches.... Sustained monitoring of the Earth system and targeted field campaigns will be critical, not only to improve our understanding of key processes but for establishing an observational baseline of the system behavior prior to any intervention. Monitoring and field studies would also be needed for quantifying impacts should an intervention be implemented.

These studies will yield additional benefits in our understanding of atmospheric processes and the climate system, with implications beyond what is needed for decisions related to climate intervention, such as improved weather predictions and climate projections.

The climate crisis must be addressed by ending net emissions of greenhouse gases, and at the same time, adapting to changes already happening. While it is currently premature to either advocate for or rule out climate interventions, these decisions, when they are made, must be based on the best scientific and technical information. With this goal in mind, AMS calls for a robust program of research with a strong governance framework to assess climate interventions. Such a program should be designed to provide the knowledge base to support decisions that may need to be made within the next decade regarding the inclusion of climate intervention among our responses to global warming.
Thanks to long-time Slashdot reader cstacy for submitting the article.

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