MakeSunsets has raised ~$1.8M from angels + VCs and another ~$133K in Cooling Credit sales over the past 12 months from individuals [1]. These purchases directly fund stratospheric aerosol injection — bringing awareness and cooling the Earth.
We’ve applied to SBIRs, explored DAOs, crowdfunding platforms, and are in conversations with family offices and UHNWI.
Most of our closed deals? They’ve come from Twitter and Substack. The key: talking directly to decision-makers — not committees.
Augment and repair are not the right words here. Since the Industrial Revolution, we've already been cooling the Earth by influencing radiative forcing; we're just doing it the worst way possible, by applying sunscreen at the wrong altitude (troposphere) and using too much of it.
TL;DR India should be hotter, but due to sulfur dioxide emissions at ground level the rate of warming is a third less. For reference, the current rate of warming is ~0.25C per decade.
Termination shock is already happening as we've been decreasing the amount of SO2 in the air we breathe. Peak global SO2 emissions were 131 million tons in 1979. Now it's 69 million as of 2022. We've been removing the sunscreen that unintentionally cooled the Earth, and one of the reasons why 2023 and 2024 were the hottest in recorded history.
The next step is to redeploy the SO2 that has unintentionally cooled Earth and do it better in the stratosphere with a fractional amount that we've tolerated since the start of the Industrial Revolution.
The last point about "fossil fuels can continue" is also called moral hazard. Regardless of SAI or not, we're going to keep using whatever is the cheapest and accessible fuel we have available, and right now, it's hydrocarbons pulled from the ground. We've already gotten good at recklessly warming our planet and unintentionally cooling it, so we might as well get good at cooling intentionally.
Thanks for sharing the link! The article focuses on Marine Cloud Brightening (MCB), an unscalable method of solar radiation management. MCB would require thousands of autonomous boats (ideally running without fossil fuels) to locate suitable low-altitude ocean clouds and spray them with finely misted saltwater to increase their reflectivity. At best, this method might achieve localized cooling over ocean areas, but its net impact on global temperatures remains uncertain—scientists are still debating whether it would result in overall cooling or even exacerbate warming in some regions.
The specific experiment mentioned in the article was halted due to a lack of community engagement. The organizers failed to inform or invite the local mayor to the deployment event, leading to public backlash when residents learned about it from the New York Times. Much of the misunderstanding came from a perception that the experiment involved risky technology, though in reality, it was as simple as using a patio mister mounted on a retired warship.
What I was referencing, however, is Stratospheric Aerosol Injection (SAI), which differs significantly from MCB in both the type of aerosol used (typically sulfur dioxide, SO₂) and the location of the injection (the stratosphere, rather than the lower atmosphere). If you're interested in learning more about SAI, here's an excellent primer: https://unchartedterritories.tomaspueyo.com/p/so2-injection
It's not banned, where are you getting this information? We've deployed 124 times for our customers mostly in Northern California. If you want to learn more: https://makesunsets.com/pages/new-faq
They will probably profit from the solution regardless of where you decide to send your support. For example, one of the byproducts of oil refining is sulfur. If you burn sulfur in the presence of oxygen will turn into SO2. Then you can put up in the stratosphere and cool Earth until the last drop of petrochemical is burned or alternative energy is close to free and as accessible as oil and gas.
> Dr. David W. Fahey, Director of the National Oceanic and Atmospheric Administration’s Chemical Sciences Laboratory revealed that studies show sulfur aerosols from stratospheric aerosol injection could impact the ozone layer, but not catastrophically. The 1991 Mount Pinatubo volcanic eruption demonstrated the ozone layer's resilience after temporarily cooling the planet by 0.5°C. Despite uncertainties, these findings suggest geoengineering methods like SAI could be explored without causing irreversible damage to the ozone layer.
As a co-founder of Make Sunsets, I'd like to clarify the role of SO2 in climate control. SO2 is considered "easily removable" because, when combined with water, it forms sulfuric acid and precipitates out. This mechanism partially explains why 2023 was the hottest year on record; the EPA's stringent regulations on SOx emissions have significantly reduced the aerosols in our troposphere, removing critical reflective materials.
The impact of SO2, including its effectiveness and atmospheric residence time, varies based on its deployment location (latitude, longitude, altitude), concentration, and particle size.
For instance, the International Maritime Organization (IMO) 2020 regulations have reduced SO2 emissions from cargo ships in the troposphere, leading to decreased respiratory illnesses near ports and less acid rain. However, this reduction in SO2 has also warmed ocean shipping lanes, prompting discussions about reintroducing sulfur into the troposphere. [1]
Deploying SO2 in the stratosphere, above most of the atmospheric water vapor and where winds reach speeds of 200kph, allows it to spread globally and remain airborne longer (1 to 3 years). This higher placement necessitates less frequent applications for the desired reflective effect. The 1991 eruption of Mt. Pinatubo demonstrated this, injecting 20 million tons of SO2 into the stratosphere [2], cooling the Earth by 0.5°C and, according to some models, temporarily reversing decades of warming.
Stratospheric aerosol injection (SAI) is likened to Earth's sunscreen, [3] a temporary measure to reflect the Sun's energy and mitigate warming while we address the larger challenge of removing over a trillion tons of greenhouse gases emitted since the 1850s and transitioning away from fossil fuels.
Climate change demands immediate action, and SAI offers us the critical time needed to live in a world with fewer catastrophic climate events.
[2] For reference, estimates suggest that global SO2 emissions were around 131 million tons in 1970 and continued to rise, peaking at approximately 150 million tons by the late 1980s in the troposphere.
OP here, I'd really like to understand why people are writing these comments. Is anyone willing to hop on a video call and stop hiding behind their keyboards? Here's a link to do just that: https://calendly.com/andrew-makesunsets/30min
Cool regards,
Andrew Song
Co-founder of Make Sunsets
