Scientists are exploring an idea that could save our planet from global warming by blocking the sun: a “giant umbrella” place in space to block out some of the sun’s light.
Led by Yoram Rozen and his team at the Asher Space Research Institute and Technion-Israel Institute of Technology, the plan involves constructing a prototype to demonstrate the feasibility of the concept.
For the idea to work, the space shield would have to span an area of roughly one million square miles, or about the size of Argentina. Because this is too large a structure to launch into space with a single rocket, Rosen and his team propose a scheme in which a swarm of smaller “umbrellas” are launched into space, where they will work in sync.
“We can show the world, ‘Look, there’s a solution that works, take it, scale it up,’” says Rosen.
If we block between one and two percent of our star’s radiation, we will neutralize the effects of global warming, scientists say. Deploying “umbrellas” in space may be cheaper in the long enough term than spraying aerosols into the atmosphere.
Last year, a team of scientists from Harvard and the University of Utah explored the idea of placing dust in a “Lagrange point” between the Sun and Earth to combat climate change.
Not everyone agrees with the idea. According to critics, deploying a “canopy” in space would be an incredibly expensive and unrealistic project, especially given the pace at which global warming is accelerating. In addition, the canvas will be exposed to impacts from micrometeors. It is not known how stable the structure will be. As for the swarm concept, it is more realistic, but again quite expensive.
Securing adequate funding, estimated between $10 to $20 million, is crucial for developing and testing the prototype to validate the viability of the concept.
Demonstrating the feasibility of innovative approaches like sunshade deployment underscores the role of science and technology in addressing pressing global challenges.
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