luke iseman

proud geoengineer. Cooling Earth, 1 balloon at a time. ceo @MakeSunsets, previously director hardware @YCombinator.

[luke iseman @liseman]

the end when the table leg starts lifting makes me unreasonably happy

[luke iseman @liseman]

This week I launched 8,430g of sulfur dioxide to the stratosphere. Single-handedly... and with the support of 1,084 customers;)

[Make Sunsets @MakeSunsets]

this was even more fun to do than it looks. thanks, rando statue!

[Make Sunsets @MakeSunsets]

first and definitely not the last blimp flight!

[Paul Gambill @paulgambill]

Episode 2 is live. @liseman from @MakeSunsets is deploying sulfur dioxide to the stratosphere and selling cooling credits to fund it.

I believe cooling is necessary! But I'm less sure that acting without institutional buy-in gets us where we need to go. Luke's dismissal of deployment risks is both compelling and concerning, and I'd love to hear where you come down.

Link to full episode below.

[Make Sunsets @MakeSunsets]

We just hit a new milestone!

This month, we deployed a record-breaking 23,951 Cooling Credits, offsetting the equivalent of what over 1 million mature trees lasting a year.

Yesterday’s launch helped push us over the edge: 3 biodegradable balloons, 4,585g of SO2, and a 100% success rate reaching the stratosphere.

Launch details below

[Roots of Progress Institute @rootsofprogress]

Table Stakes | @liseman

[luke iseman @liseman]

always a bad product name: “you should go the doctor: that might be a ______”

[luke iseman @liseman]

@MakeSunsets please show this post to anyone who argues we have alternatives to solar geoengineering.

[luke iseman @liseman]

Baby's First Patent: https://t.co/urE7IG4sqT

[luke iseman @liseman]

“Make Sunsets looks like amateur league, academics come across as hypocrites, and the nonprofits seem focused on complaining about anyone ever doing anything,” Iseman said in an email to E&E News. “In other words, Ben accurately documented reality.”
- https://t.co/6cRdm4AOLz

[luke iseman @liseman]

1,000 people have paid @ASong408 and I to Cool Earth 🤯

[nicolas, 30 ans @nic_carter]

incredible things are happening in the skies above modesto CA @MakeSunsets

[luke iseman @liseman]

jfc. it's like the one other geoengineering co is trying to be as sketchy as possible.
"Stardust Solutions hired the the law firm Holland & Knight in the first quarter of 2025, but the firm didn’t disclose its lobbying “due to a clerical error"

[luke iseman @liseman]

"we are ~250 years into a global geoengineering experiment... It isn’t if we should start, it’s how we should continue... we can take responsibility for everything humans *do*, not just what we *mean to do.*" - https://t.co/DFPI2g6ffc @PeterOlivier

[Jon Leland @JonathanLeland]

@PeterOlivier We are the world’s geoengineers and we might as well get good at it

[luke iseman @liseman]

whoops

[luke iseman @liseman]

battery died after (junk) barometer readings confused (accurate) gps. sensor fusion great... until it isn't

[luke iseman @liseman]

1 minute up to 21km and (almost) back down. freeze literally on any frame for a beautiful view