We have launched 64 balloons and cooled 32,785 ton-years of CO2

Committed to science, biased towards action.

At Make Sunsets, we believe that we have a responsibility to make bold moves to combat climate change. We're not afraid of controversy or challenges, and are passionate about developing innovative solutions to mitigate the worst effects of global warming. The science and math back us up, but we also recognize that there are unknowns and risks associated with stratospheric aerosol injection (SAI). With climate change rapidly transforming our world, it's crucial that we prioritize action over words. We believe the best time to field test and scale SAI is now.

Our roadmap
Q1 2024
Over 26,000 ton-years cooling achieved.
May 2023
Over 2,500 ton-years cooling achieved.
April 2023
Telemetry to confirm deployment altitude within 20 meters.
February 2023
First stratospheric aerosol deployment and first order fulfilled in the USA.
November 2022
First Make Sunsets cooling credits sold to customer.
October 2022
Make Sunsets incorporated and funded. Andrew joins as co-founder.
April 2022
Luke achieves first known stratospheric aerosol injection by launching two weather balloons in Baja California, Mexico.
Our values

We are self-starters who take initiative. We are not afraid to take on big challenges and pursue ambitious goals, even in the face of adversity.


We value resourcefulness and adaptability in the face of challenges. We are willing to take risks and think creatively to find solutions, even in the absence of clear guidance or established approaches.


We hold ourselves accountable through the monthly newsletter and blog sharing how much money we have in our company bank account, our monthly spend, wins/learnings, and what our goals are for next month for our customers, investors, and SAI-curious.

Continuous Improvement

We are always seeking to learn and improve, both as individuals and as an organization, to better serve our mission and our stakeholders.

Environmental Stewardship

We are committed to protecting the environment and mitigating the impact of climate change through innovative solutions and calculated risks.

Scientific Excellence

We strive for excellence in all aspects of our work, relying on rigorous scientific research and analysis to guide our decisions and actions.

Meet the founders of Make Sunsets: Luke Iseman and Andrew Song

In 2015, they met in San Francisco, CA through their shared passion for hardware companies and helping entrepreneurs go from 0 to 1, while Luke was Director of Hardware at Y Combinator and Andrew was an Outreach Manager at Indiegogo. Luke and Andrew went on to start separate hardware companies backed by Y Combinator, angel investors, and VCs. Between the two of them they’ve helped sell millions of dollars worth of hardware and software at various venture backed startups. Now they have the privilege to build a company that will help future generations combat the worst effects of climate change.

Make Sunsets is backed by Boost VC, Draper Associates, Pioneer Fund, and angel investors.

Help us cool Earth

We hope you’ll join our journey by purchasing a cooling credit, signing up for our newsletter, or partnering with us. Let's work together to cool our planet for future generations.