The Senate’s point person on climate change legislation said he doesn’t know where Gov. Charlie Baker came up with his estimate that the Legislature’s target for emissions reductions in 2030 would cost state residents an extra $6 billion.

In his letter vetoing the Legislature’s climate change bill, Baker said the difference between a 45 percent reduction in emissions by 2030 compared to 1990 levels versus a 50 percent reduction was $6 billion in extra costs incurred by Massachusetts residents. “Unfortunately, this higher cost does not materially increase the Commonwealth’s ability to achieve its long-term climate goals,” the letter said.

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