This is from
California Climate Investments.
California Climate Investments is funded by proceeds from the sale of state‑owned allowances from quarterly Cap‑and‑Trade auctions that are deposited into the Greenhouse Gas Reduction Fund (GGRF). On a yearly basis, the Legislature distributes the money from the GGRF to programs administered by different State agencies. Any program that is paid for using money from the GGRF is a California Climate Investments program.
https://www.caclimateinvestments.ca.gov/2024-profiles/high-speed-rail-progress
This is also where that credit you got recently (if you live in California) on your power bill came from.