California passed a first-of-its-kind bill mandating pollution disclosures, including supply chain emissions

(Verge) California legislators passed a bill Monday night that would force big companies doing business in the state to disclose how much planet-heating carbon dioxide pollution they create. It will be the first mandate of its kind in the nation if it’s signed into law and comes as the SEC drags its heels on a similar federal mandate.

The bill, SB 253, requires the California Air Resources Board to develop rules by 2025 for companies with annual revenues over $1 billion. By 2026, the companies would have to publicly report greenhouse gas emissions that come from their operations and electricity use. Crucially, they’ll also be required to disclose how much pollution is generated by their supply chains and customers by 2027.

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