Geoengineering is the use of technology to alter Earth's climate. It may have become the topic of daily small talk, but the weather and its changing states has a big impact on individuals, localized areas and our planet as a whole.
In some countries, the prolonged lack of rain creates harsh, dry conditions, while others are constantly threatened by surges of floodwater.
Why do some scientists support geoengineering?
As modern technology advances and our understanding of meteorological processes grows, scientists are discovering new ways to control the weather. Instead of succumbing to nature's schedule, projects are in place to make the skies rain, remove carbon dioxide from the atmosphere and prevent extreme weather events such as hurricanes and flooding.
The reasons for weather manipulation can vary from the convenient to the essential. Geoengineering is the term used to describe the manipulation of weather to combat the effects of global warming. These methods are generally split into two categories– carbon dioxide removal and solar geoengineering.
Controlling the weather from space(opens in new tab)
Geoengineering projects are all created to change Earth's climate. While many are intended for use on ocean surfaces and in Earth's atmosphere, not all of these projects are designed to function on our planet.
Space geoengineering involves taking a large step back from Earth, in an attempt to make more significant alterations. Entering into space means being closer to the sun, and so much of the geoengineering technology envisaged for Earth's orbit involves manipulating the sunlight that illuminates our planet.
Can we block the sun?
The first idea for this form of space-based technology came from engineer James Early in 1989. His concept involved building a giant glass sheet of 2,000 kilometres in width, according to the British Interplanetary Society (opens in new tab).
When orbiting Earth, this glass structure would serve as a barrier between the sun and Earth, reflecting sunlight back into space and reducing the radiation that entered Earth's atmosphere. This substantially sized, solid structure would be incredibly expensive to fly to space and would likely need to be assembled in space. In space assembly technology is something that is currently being experimented with, according to the Chinese Journal of Aeronautics (opens in new tab).
As we have no long-term human presence on another planetary body, some of today’s scientists have envisaged a more manageable array of smaller mirror satellites and areas of dense asteroid dust to serve as a solar barrier.
You can read more about solar geoengineering with this explainer article from Carbon Brief (opens in new tab). Explore Geoengineering even further with this educational material from Harvard University (opens in new tab). For more information about geoengineering in space, NASA has answered 5 common questions about hacking the planet (opens in new tab).
- Oxford Geoengineering Programme, "What is Geoengineering" http://www.geoengineering.ox.ac.uk (opens in new tab)
- McInnes, Colin R. "Space-based geoengineering: challenges and requirements (opens in new tab)." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 224.3 (2010): 571-580.
- Baum, Chad M., Sean Low, and Benjamin K. Sovacool. "Between the sun and us: Expert perceptions on the innovation, policy, and deep uncertainties of space-based solar geoengineering (opens in new tab)." Renewable and Sustainable Energy Reviews 158 (2022): 112179.