Too Little Too Late?

ThinkProgress has a deep dive on the biomass amendment Sen. Susan Collins proposed earlier this week:

Environmentalists around the country are now incensed over an approved amendment categorizing bioenergy as carbon neutral--a move that groups say puts forests and even portions of the Clean Power Plan at risk.

"I think it's a very dangerous amendment," said Kevin Bundy, senior attorney for the Center for Biological Diversity, in an interview with ThinkProgress. "It tries to dictate that burning forests for energy won't affect the climate, that's what the term carbon neutral is supposed to mean and that's just not true. You can't legislate away basic physics."

[...]

Environmentalists say the amendment sponsored by Sen. Susan Collins (R-ME) interferes with the EPA's efforts, as it explicitly tells agencies to adopt policies that reflect the carbon neutrality of forests' bioenergy. They also argue that it may incentivize cutting forests for energy and most importantly, undo important provisions of the Clean Power Plan that call for reductions in carbon emissions from the electricity sector through increased use of renewable sources.

Some key questions: Why was the green community caught off guard here? How on earth did this thing pass on a voice vote?

And why aren't environmental organizations that endorsed Collins (like League of Conservation Voters) and those that didn't (like Sierra Club) raising a bigger ruckus in social media and elsewhere to try to head the amendment off before it becomes law?