Honestly, I'm a large proponent of conversation and environmentalism. Hell, I sit on a land trust board, and have a very strong technical background in checks notes environmental science.
The thing I keep rolling my eyes at with Greenpeace is their seemingly complete lack of regard for science, like you point out. How can anyone take these guys seriously when most of what they do are stunts.
I doubt anyone would listen even if they did have the technical expertise they need, because support for environmental issues is paltry to begin with. However, it would give them a leg to stand on.