I don't know about that, matter - antimatter reactions are said to be the most energy releasing reactions. Of course since it costs $billions to produce a nano gram of antimatter it might be a while until it becomes a viable option.
The environmentalists are against any expansion of nuclear power. So trying to build new nuclear facilities or working on fusion probably won’t be allowed.
I think Al Gore is against nuclear.
The big problem that isn’t talked about too much is that the enviro/global warming folks ara against everything that can help our energy problems. They are against drilling for more oil. They are against further development of our coal reserves. They are against building new oil refineries. They are against nuclear power. They are against new hydroelectric facilities.
It’s ironic because arguably more nuclear power would cut back on the greenhouse gases. But the enviro lobby is against it.