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Climate

The Mountains Are Getting Too Hot

It’s going to be a nasty climbing season in the West.

Mt. Baker.
Heatmap Illustration/Getty Images

It is a cliché that everyone in the insurance industry believes in climate change. But the same can certainly be said of those in the mountain-guiding business.

May marks the beginning of the recreational mountaineering season on Washington’s Mount Rainier, the most popular technical climb in the country. But for many of the guide companies that take clients up the mountain, the last day of the 2026 commercial climbing season remains an ominous unknown. “We used to run a season through the end of September typically,” Jonathon Spitzer, the director of operations at Alpine Ascents, which has offered guided climbs of Rainier since 2006, told me. “For four of the last five years, we’ve ended around Labor Day or so” due to poor snow conditions on the mountain — meaning a loss of about 20% of the historic season.

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Green
AM Briefing

New Headwinds

On congestion pricing, deep sea mining, and kiwi birds

Onshore wind.
Heatmap Illustration/Getty Images

Current conditions: The weekend’s polar vortex chill in New York City is over as temperatures are set to hit 70 degrees Fahrenheit today, your humble correspondent’s birthday • A winter storm blanketing the Sierra Nevadas with as much as four feet of snow on Interstate 80’s Donner Pass, the primary route between Sacramento and Reno named for the notorious 1846 episode of snowbound settlers driven to cannibalism • Days after thermometers finally slid from an almost sauna-like 118 degrees to somewhere in the 90s, thunderstorms are deluging India’s northern Uttar Pradesh state as dust storms blast cities such as Kanpur.


THE TOP FIVE

1. Trump halts construction on onshore wind, citing national security

The Trump administration is bringing construction of virtually all new onshore wind turbines to a halt, putting as many as 165 projects on pause on the grounds that they may threaten national security. The projects, sited on private land, are being stalled by the Department of Defense, and include “wind farms which were awaiting final sign-off, others in the middle of negotiations, and some that typically would not require oversight” by the military, according to the Financial Times. Wind farms require routine approvals from the Pentagon to make sure turbines don’t interfere with radar systems. Normally these assessments are done in a few days. But developers told the newspaper they have faced a mix of setbacks since last August.

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Blue
Climate Tech

Funding Friday: Space Solar Goes Meta

Plus news on cloud seeding, fission for fusion, and more of the week’s biggest money moves.

Earth and space solar.
Heatmap Illustration/Getty Images, Overview Energy

From beaming solar power down from space to shooting storm clouds full of particles to make it rain, this week featured progress across a range of seemingly sci-fi technologies that have actually been researched — and in some cases deployed — for decades. There were, however, few actual funding announcements to speak of, as earlier-stage climate tech venture funds continue to confront a tough fundraising environment.

First up, I explore Meta’s bet on space-based solar as a way to squeeze more output from existing solar arrays to power data centers. Then there’s the fusion startup Zap Energy, which is shifting its near-term attention toward the more established fission sector. Meanwhile, a weather modification company says it’s found a way to quantify the impact of cloud seeding — a space-age sounding practice that’s actually been in use for roughly 80 years. And amidst a string of disappointments for alternate battery chemistries, this week brings multiple wins for the sodium-ion battery sector.

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Green