Today: The EPA wants to dismantle a core climate principle; a big U.S. rooftop solar installation project kicks off; data center costs fuel financial fights.

Welcome back: The Environmental Protection Agency has taken what is arguably its most consequential move yet under the Trump administration by moving to nix a finding about the harms caused by greenhouse gases, the WSJ’s Scott Patterson and Eric Niiler write.

The EPA said it was seeking to rescind what’s known as the government’s endangerment finding. The 2009 declaration states that greenhouse gases threaten public health and welfare by raising global temperatures, increasing the likelihood of heat waves, more intense hurricanes and storms with heavy rainfall.

In doing so, the Trump administration is taking a big swing at toppling the landmark scientific finding on greenhouse-gas emissions that the government has used to regulate emissions from power plants, aircraft, cars and more.

The administration argues that the original 2009 finding was “unduly pessimistic” regarding increases in greenhouse-gas emissions and global temperatures.

See also: New EPA leader shakes up agency with a "drill baby drill" mandate

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A plan for the largest industrial rooftop solar installation in the U.S. is under way, Don Nico Forbes writes for WSJ Pro Sustainable Business.

Solar technology firm SolarEdge partnered with Solar Landscape, a developer of rooftop solar projects, to install 630 megawatts of solar capacity across more than 500 commercial rooftops in the U.S.

With power demand rising in the U.S., some see commercial rooftops as an opportunity to provide more clean energy without disturbing homeowners. Instead the roofs of factories and warehouses are being targeted to provide extra energy—and could potentially power 16% of U.S. household demand.

Despite rising demand, rooftop solar faces an uncertain future amid a shifting policy landscape. Some tax incentives for solar projects in former President Joe Biden’s Inflation Reduction Act are set to expire next year. Meanwhile, President Trump’s “big beautiful bill” could make financing deals harder.

Utilities and technology companies are at odds over who should pay for electricity costs in the unprecedented data-center build-out, the WSJ’s Katherine Blunt reports.

Across the U.S., utilities are asking tech companies including Google, Microsoft and Amazon to pay more to connect their new data centers to the power grid.

The tech companies, meanwhile, say they are committed to paying their fair share of power costs, but that they shouldn’t have to pay substantially more for grid investments needed to serve them because some of those upgrades also benefit other customers.

U.S. power companies are already charging more to cover a surge in spending to upgrade the aging grid, address risks related to climate change and support drivers of power demand such as data centers and electric vehicles.

• Finding faster, cheaper ways to get to bacon (WSJ) 
   
• How Trump's loathing for wind turbines started with a Scottish court battle (BBC)
   
• Trump promised a drilling boom. The new rigs haven’t showed up yet. (Inside Climate News)
   
• Natural disasters have caused more than $131 billion in losses so far in 2025 (CBS)
   
• Trump’s $750 Billion deal for U.S. energy collides with market reality (WSJ)

WSJ Pro Sustainable Business gives you an inside look at how companies are tackling sustainability. Send comments to bureau chief Perry Cleveland-Peck at perry.cleveland-peck@wsj.com and reporters Clara Hudson at clara.hudson@wsj.com and Yusuf Khan at yusuf.khan@wsj.com. Follow us on LinkedIn at wsjperry, clara-hudson and yusuf_khan.