SB253 would require companies which have over a $1 billion in revenue and do business in California to disclose their greenhouse gas emissions (including indirect ones caused by use of their products) if it becomes law. This would be the first meaningful disclosure requirement for most companies, and would make accountability possible for the first time.

SB253 passed the California State Senate this spring, and is coming up for a vote in the State Assembly. The vote is likely to be close.

If you're in California, it's worth making two phone calls, the first to the State Assembly Speaker, Rivas at: (916) 319-2029 asking for his support, and the second to your representative in the assembly. When they pick up the phone or you reach an answering machine, give your name, what town or city you live in or near, and ask for their support for SB253.

Edit: SB253 made it out of the suspense file, with a final vote coming later this year:

And here’s a big duo that made it through: SB 253, by Sen. Scott Wiener (D-San Francisco), and SB 261, by Sen. Henry Stern (D-Sherman Oaks), which would require large corporations operating in the state to disclose both their emissions and the financial risks they face due to climate change.

SB253 got minor amendments on Friday to adjust the fee companies will pay to comply with the bill and to give the Air Resources Board the option in 10 years to base the emissions disclosures on a different emissions framework. The bills aren’t expected to come to the Assembly floor until the last week of session, and it’s going to be a squeeze. Supporters are planning to meet with recalcitrant lawmakers at the Capitol this Wednesday.