Scientists from Africa, Asia and South America are getting a new infusion of $900,000 to study the effects of reflecting sunlight to cool the Earth and mitigate the impacts of global warming. The money comes from Open Philanthropy, a venture funded primarily by billionaire Dustin Moskovitz, a co-founder of Facebook and Asana, and his wife, Cari Tuna.

Sunlight reflection involves releasing aerosols like sulfur dioxide high in the atmosphere to reflect the sun’s rays back into space, temporarily mitigating global warming. (It’s sometimes called solar radiation modification or solar geoengineering.)

The idea has been around for decades, but it is being taken more seriously as the effects of climate change become more apparent. While volcanic eruptions have proven that the technique can work, there are significant risks as well, including damage to the ozone layer, acid rain and increased respiratory illness.

On Tuesday, non-profit research organization The Degrees Initiative and the UN’s World Academy of Sciences announced they are distributing more than $900,000 to scientists across Africa, Asia and South America to study solar radiation modification in a program called “The Degrees Modelling Fund.” The Degrees Initiative has been funded by various donors over the years, but the biggest has been Open Philanthropy and all of the $900,000 disbursement announced Tuesday came from that group, co-founder Andy Parker told CNBC.

The money will go to 81 scientists in Benin, Brazil, Cameroon, Chile, Ghana, India, Indonesia, Malaysia, Mali, Nigeria, Pakistan, South Africa, Thailand and Uganda working on 15 solar geoengineering modeling projects.

Sunlight reflection is getting more attention as scientists have started suggesting that its negative effects may not be as bad as the harm from climate change will be in the future. The White House Office of Science and Technology Policy is coordinating a 5-year research plan into solar geoengineering and in January, the quadrennial U.N.-backed Montreal Protocol assessment report included an entire chapter addressing stratospheric aerosol injection for the first time ever.

“Like anyone else sensible, when I first heard about the idea of blocking out the sun, I thought it was a terrible idea. As time goes, by the view didn’t really change it. It’s a horrible idea,” Parker told CNBC. “But it may prove to be less horrible than not using it and allowing temperatures to keep rising if we don’t cut our emissions far enough.”

Sunlight reflection is not a solution to climate change or global warming. It is a relatively fast and inexpensive way to temporarily cool the Earth. We know it works: In the 15 months following the eruption of Mount Pinatubo in the Philippines in 1991, the average global temperature was about 1 degree Fahrenheit lower, according to NASA. Releasing sulfur dioxide into the stratosphere from retrofitted planes would essentially mimic the way a volcano releases large quantities of aerosols into the atmosphere.

“It’s not a pleasant idea. It’s not a fun thing to work on. But it’s potentially important, it could be very, very helpful, it could be disastrous,” Stone told CNBC.

“I liken the decision to chemotherapy. Chemotherapy to treat cancer is also a horrible idea. It’s very dangerous. It’s unpleasant. It’s risky. And no one would ever consider doing it unless they feared the alternative might be worse. And so it goes for solar geoengineering,” Stone said.

Before launching The Degrees Initiative, Stone led the production of a 98-page report on geoengineering for The Royal Society, an independent science academy in the United Kingdom, and has done research at Harvard and the Institute for Advanced Sustainability Studies Potsdam.

Ines Camilloni, a professor at the University of Buenos Aires, has received two Degrees Initiative grants and is also getting funded by the government of Argentina. With the funding, Camilloni is researching how solar radiation modification would impact the hydroclimate of La Plata Basin, the fifth largest water basin in the world, covering parts of Argentina, Bolivia, Brazil, Paraguay and Uruguay, she told CNBC.

“A large fraction of the economic activities within the basin relies on water availability, including agriculture, river navigability and hydroelectric production, and therefore any variations in the water cycle of the basin could have significant impacts on the economy of each country,” Camilloni told CNBC.

Camilloni says her research has so far showed that sunlight reflection could be helpful to some parts of the La Plata Basin region, but particularly harmful to others. Large rivers that power hydroelectric dams could see highrer flows and increased energy production, balanced by a risk of more flooding.

In Buenos Aires, awareness of sunlight reflection has grown in the last couple years, and it spurs strong emotions.

“The range of feelings that solar radiation modification generates goes from disbelief to fear. Everyone perceives it to be controversial,” Camilloni told CNBC.

Clear communication is critical, because even research proponents do not see is as a climate change silver bullet.

“This is no one’s Plan A for how you deal with climate risk, and whatever happens, we have to cut our emissions,” Stone told CNBC. “But people are starting to finally starting to seriously address the question: What do we do if we don’t do enough with emissions cuts, if they prove insufficient to avoid very dangerous climate change? What are our options? And that leaves people regretfully, but necessarily, to think about things like solar radiation modification.”