The short answer is the fossil fuel industry and those who support it desperately want to encourage any kind of infighting among any and all people concerned with the climate; Greenpeace itself has been funded massively by the oil and coal industries throughout its lifetime specifically to oppose nuclear power. It’s news now because as we look towards energy generation over the next 50 years we can either have large amounts of LNG and coal power plants while we pretend there’s enough Lithium on Earth to support a renewable-based grid, or we can essentially eliminate 100% of natural gas, coal, and oil-based power plants in the next 15 years and work towards renewable grids with post-lithium power storage over the next 150 years. That latter scenario would nearly eliminate the global coal and natural gas industries, and severely harm the oil industry. So the more ‘division’ they can sow to delay a decision in either direction, the better it is for them.