At the end of 2022, climate startup Make Sunsets announced it had launched two payloads of reflective sulfur into the New Mexico sky as proof of concept for its planet-cooling technology. By filling the sky with sun-reflective sulfur, the company hopes to attack climate change directly by simply reducing the world’s temperature — and it’s hoping to make a fortune in the process by selling carbon credits to greenhouse gas emitters.

But because blocking out the sun would produce catastrophic consequences for food and energy production and even human health, these credits would have to include both the “cost” of each ton of carbon dioxide offset by the sulfur and the negative effects of less sunlight reaching the Earth. Once accounting for the damage from blocking our sun, it’s likely Make Sunrise’s credits are worth less than zero and are a net liability for humanity that could, if scaled, cause significant damage to our planet.

To prevent financial fraud and ecological catastrophe, including acid rain, the Biden administration must take immediate action to shut the company’s operations down for good.