NOV 29, 2018 10:12 AM PST

How serious are we about solar geoengineering?

Just how close are we exactly to launching a large-scale solar geoengineering project? That’s the question a new study published recently in Environmental Research Letters tried to answer. The study looked at the realities behind the idea of injecting aerosols into the atmosphere from high-altitude aircraft in an attempt to reduce Earth’s warming.

Though the idea isn’t new, the technology behind it is still unreasonably expensive, determined the study. While there are several contemplated methods of injecting sulphates into the lower stratosphere (a process called stratospheric aerosol injection or SAI), the costs of implementing any of the currently available methods are not practical on a large scale.

The researchers considered the case of one such hypothetical project that would commence in fifteen years with the intention of using SAI to cut the increase in anthropogenic radiative forcing in half. Co-author Dr. Gernot Wagner commented: "While we don't make any judgment about the desirability of SAI, we do show that a hypothetical deployment program starting 15 years from now, while both highly uncertain and ambitious, would be technically possible strictly from an engineering perspective. It would also be remarkably inexpensive, at an average of around $2 to 2.5 billion per year over the first 15 years."

Wagner’s co-author, Wake Smith, explained that part of the expense comes from the infeasibility of current aircraft to do the job. “It would indeed take an entirely new plane design to do SAI under reasonable albeit entirely hypothetical parameters,” he said. “No existing aircraft has the combination of altitude and payload capabilities required." Such an aircraft would have to be able to sustain level flight at 20 kilometers.

Smith and Wagner elaborated more on the design of this futuristic stratosphere-flying plane, which they call SAIL, or SAI Lofter. Using measurements and data from aerospace and engine companies, the researchers developed the hypothetical SAIL: “It's equivalent in weight to a large, narrow body passenger aircraft. But to sustain level flight at 20 kilometers, it needs roughly double the wing area of an equivalently sized airliner, and double the thrust, with four engines instead of two. At the same time, its fuselage would be stubby and narrow, sized to accommodate a heavy but dense mass of molten sulphur rather than the large volume of space and air required for passengers."

Nevertheless, don’t get too excited about this solar geoengineering future – the authors don’t think the idea is that close to becoming a reality just yet.

Sources: Science Daily, Environmental Research Letters

About the Author
BA Environmental Studies
Kathryn is a curious world-traveller interested in the intersection between nature, culture, history, and people. She has worked for environmental education non-profits and is a Spanish/English interpreter.
You May Also Like
SEP 01, 2022
Earth & The Environment
Simulations Utilized to Study Earth-Cooling Strategies
SEP 01, 2022
Simulations Utilized to Study Earth-Cooling Strategies
In a recent study published in the Proceedings of the National Academy of Sciences, an international team of researchers ...
SEP 02, 2022
Cannabis Sciences
How to harvest really good cannabis
SEP 02, 2022
How to harvest really good cannabis
What's the secret to growing a great crop of cannabis? There's several factors.
SEP 08, 2022
Earth & The Environment
Climate Change Could Lead to Obscure Sleep Cycles and Weakened Immune Systems
SEP 08, 2022
Climate Change Could Lead to Obscure Sleep Cycles and Weakened Immune Systems
In a recent study published in Temperature, a researcher from the University of California, Los Angeles (UCLA) discusses ...
SEP 10, 2022
Technology
New Materials Produced from Copying Termite Behavior
SEP 10, 2022
New Materials Produced from Copying Termite Behavior
In a recent study published in Science, a team of researchers from the California Institute of Technology (Caltech) disc ...
SEP 07, 2022
Health & Medicine
What's in Fake Meat & Is it Healthy?
SEP 07, 2022
What's in Fake Meat & Is it Healthy?
Animal agriculture has a massive impact on our world. There are huge environmental consequences to our planet, in part b ...
SEP 14, 2022
Space & Astronomy
Looking Back in Space: NASA's Project Gemini
SEP 14, 2022
Looking Back in Space: NASA's Project Gemini
This series will explore historic space missions from the start of the Space Age to the present day, including both crew ...
Loading Comments...