jo melville
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jmelville.science
jo melville
@jmelville.science
climate tech (electrochemistry, industrial decarb, synthetic fuels, carbon removal, deep biogeochemistry, solar radiation management)
formerly: ARPA-E, Georgetown, MIT (PhD), UC Berkeley (BSc)
ask me anything: https://jmelville.science/ask/
🇺🇸→🇸🇬
wow, I'm a pretty climate-literate person but this is the first time I've heard this stat. can you recommend a reference to substantiate the 5.5% figure / that military emissions are generally not included in traditional estimates?
November 22, 2025 at 6:55 AM
"including digital descendents" idk what this means but there are ~10^80 atoms in the universe, mostly hydrogen. split 10^58 ways that is ~10^22 atoms per sentient being. so the entire universe turned into human moral equivalents at a ratio of ~0.01 grams of hydrogen per human equivalent
November 22, 2025 at 6:38 AM
curious how this will square with the incipient LNG boom
November 20, 2025 at 11:55 AM
"[...] To hope is to give yourself to the future — and that commitment to the future is what makes the present inhabitable."

www.haymarketbooks.org/books/791-ho...
Hope in the Dark
Bestselling author Rebecca Solnit reminds us that activism has changed the world in remarkable ways.
www.haymarketbooks.org
November 20, 2025 at 11:50 AM
on the other, I recall this quote from Hope in the Dark by @rebeccasolnit.bsky.social:

"Hope is not a lottery ticket you can sit on the sofa and clutch, feeling lucky. It is an axe you break down doors with in an emergency."
November 20, 2025 at 11:50 AM
fossil words are a real thing! though they typically refer to archaic words that are "frozen in time" through their sole remaining use in common idioms:

en.wikipedia.org/wiki/Fossil_...
Fossil word - Wikipedia
en.wikipedia.org
November 19, 2025 at 12:02 PM
the "hydro" in magnetohydrodynamics is indeed a fossil etymology and doesn't necessarily refer to water — see also e.g. "hydraulics" which originally meant "water piping" but now refers generally to the mechanics of incompressible liquids
November 19, 2025 at 11:43 AM
not sure if you're being sarcastic but the "hydro" in "hydrocarbon" does indeed refer to hydrogen. hydrocarbons can be non-fluids (e.g. solid paraffin waxes) — the "hydro-" is a remnant of hydrogen's own etymology that water (hydro) is *gen*erated when it is combusted
November 19, 2025 at 11:43 AM
oh my god they got Jonkers
November 19, 2025 at 7:59 AM
fossil fuels will get more expensive as shallow reserves are depleted and companies shift to more expensive and deeper secondary reserves. but we can't count on that scarcity to singlehandedly effect a shift to clean energy, especially if governments continue to subsidize fossil infrastructure
November 19, 2025 at 6:34 AM
i'm unequivocally against fossil energy but the notion that we will run out of coal or oil has been shown to be false since the theory originated in the ~70s.

there is more than enough fossil carbon in the crust to push atmospheric CO2 >1000ppm. (whether those reserves are economical is another q)
November 19, 2025 at 6:33 AM
cost of oil (WTI crude) in 1988: ~$40/bbl (inflation-adjusted)

cost of oil in 2025: ~$60/bbl

~50% cost increase

🔌💡
November 19, 2025 at 3:18 AM
only semi-related but when/why did we allow these dipshits to commandeer the ✨ emoji. AI is not magic, it does not leave a fucking trail of pixie dust. use the 🤖 emoji you soulless robotic freaks
November 18, 2025 at 7:01 AM
Reposted by jo melville
is it good when py and python are different versions
November 18, 2025 at 2:10 AM
deca- has always been an oddball prefix because it's the only (?) SI prefix to have a two-letter abbreviation. like whaddya mean a decameter is a 'dam'?
November 18, 2025 at 3:59 AM
"in stage 3, the missile approaches a speed of 3900 standard squares per combat round"

—Monster Manual, Kalibr missile statblock
November 18, 2025 at 3:55 AM
not currently in DC, but neither is National Harbor — the convention center is a good 30min drive south from the city proper
November 18, 2025 at 3:51 AM