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The Best Way to Find Out if We Can Cool the Planet

A few years ago, the idea of deliberately blocking the sun to combat climate change was taboo for scientists. But a lot can change in a short time.

As the disastrous effects of climate change mount, Congress has asked federal scientists for a research plan, private money is flowing and rogue start-ups are attempting experiments — all signs that momentum around solar geoengineering is building fast. The most discussed approach involves spraying tiny particles into the stratosphere to reflect sunlight and cool the planet. Other proposals include injecting sea salt into clouds to increase their reflectivity or using giant space parasols to block the sun.…  Seguir leyendo »

Iron Dust Could Reverse the Course of Climate Change

For a while it seemed switching to clean energy might be enough to stave off climate catastrophe. But even though the United States has cut coal-fired electricity use from 50 percent to 19.5 percent in the past 20 years, the growth of coal in the rest of the world and the rising demand for energy overall — not to mention the extreme weather we are all experiencing — make it clear that we desperately need another solution.

As crazy as it might sound, geoengineering the oceans by adding iron — in effect, fertilizing them — may offer the best, most effective and most affordable way not just to slow the march of global warming but to reverse its course by directly drawing carbon out of the atmosphere.…  Seguir leyendo »

My Continent Is Not Your Giant Climate Laboratory

Several environmentalists last year presented Africa’s leading climate negotiators with a bold idea: A technology called solar geoengineering could protect their countries from the worst effects of climate change, they said. While insisting they were impartial, representatives from the Carnegie Climate Governance Initiative said that these technologies, which claim to be able to re-engineer the climate itself, either by dimming the sun’s rays or reflecting sunlight away from the earth, could quickly and cheaply turn the tide of dangerously rising temperatures — and that poor countries might have the most to gain.

It wasn’t the first time Westerners have tried to persuade Africans that solar engineering projects may be in our best interest.…  Seguir leyendo »

Smoke shrouding a bridge in Seattle, Washington, October 2022 Matt Mills McKnight / Reuters

“Geoengineering” can mean a number of things, but it usually refers to the attempt to offset the rising global temperatures that result from the greenhouse effect by introducing particles in a systematic and sustained way into the earth’s atmosphere so that it better reflects the sun’s rays. Although the idea sounds futuristic, the basic concept has been around for a long time. In 1965, a group of scientific advisers to U.S. President Lyndon Johnson suggested that some kind of tinkering with the planet’s mechanics might be necessary. “The climatic changes that may be produced by the increased [carbon dioxide] content could be deleterious from the point of view of human beings”, they noted.…  Seguir leyendo »

Pese a los efectos cada vez más evidentes del cambio climático, el avance hacia la reducción de las emisiones de gases de efecto invernadero sigue siendo tan decepcionante como siempre. Eso llevó a algunos a promover nuevas soluciones tecnológicas presuntamente capaces de evitar una catástrofe. Por ejemplo, David Keith, de Harvard, propone confiar en la geoingeniería, es decir, la ejecución deliberada de intervenciones sumamente riesgosas a gran escala sobre el sistema climático de la Tierra.

El pasado marzo, en la conferencia de las Naciones Unidas sobre medioambiente en Nairobi (Kenia), Estados Unidos y Arabia Saudita bloquearon un llamado a un análisis profundo de la geoingeniería y de sus implicaciones para la gobernanza internacional.…  Seguir leyendo »

El cambio climático plantea a la humanidad una amenaza inédita, que parece cada vez más encaminada a reducir drásticamente los niveles de vida en todo el mundo en el transcurso de nuestras vidas y provocar enormes daños a más largo plazo. Y como un desafío planetario de semejante magnitud demanda una respuesta radical, ha habido un amplio debate sobre las acciones que el mundo debe emprender urgentemente para limitar el aumento de temperaturas globales a menos de 1,5 °C por encima de los niveles preindustriales.

La máxima prioridad tiene que seguir siendo la reducción de emisiones de gases de efecto invernadero, pero el Grupo Intergubernamental de Expertos de las Naciones Unidas sobre el Cambio Climático (IPCC) declaró que no es suficiente.…  Seguir leyendo »

El Acuerdo de París de diciembre del 2015 pretende limitar el aumento de la temperatura del planeta a 1,5 o 2 grados centígrados por encima de los niveles preindustriales. Sin embargo, hoy sabemos que alcanzar tal objetivo va a requerir unos esfuerzos de reducción de las emisiones de gases de efecto invernadero mayores de los asumidos por la comunidad internacional con la firma del mencionado acuerdo. Este desafío está propiciando un interés creciente por las tecnologías de geoingeniería climática. Estas pretenden alterar de forma intencionada el clima del sistema Tierra, como parte de la respuesta de los humanos a la amenaza del calentamiento global.…  Seguir leyendo »