There’s not just one group of environmentalists. Some are deeply motivated by non-environmental concerns, others just want to fix climate change and ecosystem destruction, and are quite happy with technical solutions including fission reactors. James Hansen, James Lovelock, Stewart Brand, and many others are in the latter group.
This particular group sounds closer to the former. For people in that crowd, I would emphasize the decentralization inherent in focus fusion’s small reactors, along with LLP’s determination to liberally license the technology. Also of course the lack of neutron radiation and nuclear waste.
Of course I’m a little late with my comment. How’d it go?