The plan, known as GreenWorks, was first laid out in broad strokes by House Speaker Robert DeLeo in February. The announcement sparked excitement because the House has traditionally been unwilling to take bold action on climate change issues, said Deborah Donovan, Massachusetts director of the Acadia Center, a nonprofit that advocates for solutions to climate change.

This uncertainty is not good enough, Donovan said.

“We’re working with the Legislature to make it clear that we need more than an empty bag that could maybe get filled,” she said.

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