Bill Gates Funded Solar Dimming Research. No Particle Followed

The story that has been spreading says Bill Gates funded a plan to dim the sun through Harvard. The fact that gets left out most often: the project never released a single particle into the stratosphere, and the experiment was cancelled back in March 2024.

What killed the project was also not "public anger" as the viral version has it. It was the Sámi Council, which objected because the trial had been planned on their lands without ever consulting them.

And there is an even bigger misreading, in the word "weather".

Two Technologies That Keep Getting Merged

• Solar geoengineering (SAI) — injecting reflective particles into the stratosphere to bounce sunlight back to space. This is what SCoPEx was testing
• Weather modification — seeding salt crystals into clouds to make rain. This is what the UAE and China do
• They are different technologies, with different costs and different risks. The bans in Florida and Tennessee target the second one

SCoPEx is about the first. The bans in two US states are about the second. Merging them invents a policy that never existed on paper.

What SCoPEx Actually Was

• Run by Harvard, planned for Kiruna, northern Sweden
• At 20 kilometres above sea level, roughly 12 miles
• The material tested was calcium carbonate, a chalk-like substance, not sulphate particles
• The aim was to measure how particles mix in the stratosphere
• The quantities involved were far smaller than emissions from aircraft and rockets
• No particle was ever released

The choice of material had a technical reason. Sulphate particles can accelerate chemical reactions and damage the ozone layer, so from 2016 Harvard researchers proposed calcium carbonate as an alternative that would theoretically reduce ozone loss instead.

The test flight, originally scheduled for 2021 in Kiruna, was postponed after the Sámi Council sent an open letter. In March 2024, Harvard formally cancelled SCoPEx in a joint letter from the provost and the vice provost for climate and sustainability.

On Bill Gates

This part needs to be read carefully, because it involves a named person who should not be misrepresented.

What is genuinely documented is this. Science reported in January 2010 that Gates put at least $4.5 million of his own money into research over three years covering stratosphere modification, direct air carbon dioxide removal, and brightening marine clouds. His name also appears on the donor list of the Harvard Solar Geoengineering Research Program, which is the program that funded SCoPEx.

But two facts almost always vanish from the viral version. First, according to Ken Caldeira of the Carnegie Institution, Gates's money did not fund any field experiments involving those techniques. Second, SCoPEx never released a particle, so no plan to dim the sun was ever carried out.

Gates himself has described geoengineering as a way to buy time, not as a solution to the climate problem. In the same piece he called it one of several avenues worth researching, alongside clean energy, efficiency and conservation.

Naming Bill Gates as a funder of climate research is not an accusation. Turning research funding into evidence of an attack on the sun is, and no data supports that.

Two States That Outlawed It

This part is more concrete than the version usually circulating, because both are now law.

• Florida — SB 56, sponsored by Senator Ileana Garcia, signed by Governor Ron DeSantis on 20 June 2025
• A violation is a third-degree felony, punishable by up to 5 years in prison and fines of up to $100,000
• The law repealed every existing weather modification statute, including Florida's own cloud seeding licence programme
• From 1 October 2025, publicly owned airports must report aircraft equipped for dispersing such substances
• Tennessee — HB 1112, the first state to ban the practice, in force since 1 July 2025
• A violation is a Class A misdemeanor plus a $100,000 fine per instance

Both laws prohibit injecting substances into the atmosphere "for the express purpose of affecting temperature, weather, or the intensity of sunlight". That wording reaches far beyond cloud seeding.

There is a genuine dispute around the Florida bill. Reporting noted one lawmaker saying it was feeding into conspiracy theories, and the term "chemtrails" appears nowhere in the statute itself, though it came up in debate and on social media.

The UAE and China

• United Arab Emirates — cloud seeding has run since 2002, using potassium chloride flares
• 187 missions in 2014, 214 in 2017, 184 in 2018 and 247 in 2019
• 219 operations were recorded in the first six months of 2020
• A study in npj Climate and Atmospheric Science estimates an extra 168 to 838 million cubic metres of rain a year
• China — official target of 5.5 million square kilometres for artificial rain and snow, plus 580,000 square kilometres for hail suppression
• India is 3.29 million square kilometres, so the Chinese target is indeed larger than India

All of this is cloud seeding aimed at making rain, not technology for dimming the sun. Placing it in the same list as SCoPEx does not hold up.

What Is Actually Worth Asking

The question worth asking is not whether rich men are dimming the sun. The more honest question is who has the authority to decide on treatments like this, and whether any damage that follows can be undone.

The Sámi Council's objection is arguably the most useful example here. Their question is simple: if an experiment is going to be carried out on our land, why were we never asked.

SCoPEx ended in 2024 without a single particle released, but geoengineering research at Harvard continues under the same program. So the argument is not over. Only the shape of the experiment changed.

To read a claim this large properly, the useful sources are not social media accounts. The Tennessee and Florida statutes, the 2010 Science report and the official UAE National Center of Meteorology records are all publicly readable. Follow Google News to keep track of it.