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What is stratospheric aerosol geoengineering?

Stratospheric aerosol injection is a solar radiation management (srm) geoengineering or climate engineering approach that uses tiny reflective particles or aerosols to reflect sunlight into space in order to cool the planet and reverse or stop Global Warming.

What is stratospheric aerosol geoengineering?

Stratospheric aerosol injection is a solar radiation management (srm) geoengineering or climate engineering approach that uses tiny reflective particles or aerosols to reflect sunlight into space in order to cool the planet and reverse or stop Global Warming.

What happens if aerosols make it into the stratosphere?

In theory, injecting aerosols into the stratosphere could cool the planet at a cost of disrupting seasonal weather patterns, leading to widespread flooding or drought. We could harm our food supply, either by reducing the amount of sunlight that reaches crops or by reducing the amount of rainfall, or both.

Is geoengineering hard?

Pros: It’s cheap, easy, and could likely avert some of the worst impacts of global warming, like sea-level rise. Cons: It could have lots of unpredictable side effects, like mucking up global rainfall patterns. It’s difficult to coordinate.

What is stratospheric aerosol injection made of?

Materials. Various forms of sulfur were proposed as the injected substance, as this is in part how volcanic eruptions cool the planet. Precursor gases such as sulfur dioxide and hydrogen sulfide have been considered.

How much would geoengineering cost?

On the other hand, David Keith tells us that geoengineering could be very inexpensive. According to him, it would cost just $10 billion, or one ten-thousandth of global GDP, whereas its benefits could be more than 1 percent of global GDP—a return one thousand times greater than its cost.

What are geoengineering techniques?

Solar Radiation Management (SRM) or Solar Geoengineering SRM techniques aim to reflect a small proportion of the Sun’s energy back into space, counteracting the temperature rise caused by increased levels of greenhouse gases in the atmosphere which absorb energy and raise temperatures.

How much does stratospheric aerosol injection cost?

Smith and Wagner concluded that pre-start costs of less than $4 billion would be sufficient to launch such an operation; that costs per lofted ton of sulfate aerosols would be in the range of $1500; and that annual operating costs in the first 15 yr would average $2.3 billion (all figures in 2018 USD).

What is stratospheric aerosol injection?

Stratospheric aerosol injection is a solar radiation management (srm) geoengineering or climate engineering approach that uses tiny reflective particles or aerosols to reflect sunlight into space in order to cool the planet and reverse or stop Global Warming.

Can stratospheric aerosol geoengineering prevent the loss of Arctic sea ice?

NCAR model simulations (Kravitz et al., 2019/Tilmes et al. 2018) also show that stratospheric sulfate aerosol geoengineering could also prevent the loss of Arctic sea ice by the end of this century (see NCAR YouTube video below).

Why is the stratosphere an ideal target for atmospheric geoengineering?

The stratosphere is an ideal target for atmospheric geoengineering because it is relatively isolated from human populations, is accessible by planes (and other transport/delivery methods), and doesn’t have weather such as rain that would cause aerosol spray particles to fall quickly to the ground.

How much sulfur is required to conduct stratospheric geoengineering?

So to conduct stratospheric geoengineering, the task would be to inject sulfur about 20 km into the atmosphere every year in the Tropics. The amount would depend on the size of the effect desired (where to set the planetary thermostat), an unresolved issue.