Most scientific and energy experts in the field of climate change support the expanded use of nuclear power. Dr. James Hansen, the senior NASA scientist who first raised the alarm about climate change with testimony to the Congress in 1988 is a staunch supporter, along with Kerry Emanuel, Tom Wigley and Ken Caldeira. Policy experts like President Barack Obama, Dr. Ernest Moniz, Dr. Stephen Chu, Carol Browner and even Michael Bloomberg support nuclear. Technologists and visionaries like Bill Gates, Paul Allen, Peter Thiel, Jeff Bezos, Stewart Brand, Jimmy Carter, Sir Richard Branson, and Paul Hawken, who listed nuclear power as one of his top Global Warming solutions in Drawdown: The most comprehensive Plan ever Proposed to Reverse Global Warming. Current politicians who support nuclear include Republicans Lisa Murkowski (Sen. Alaska), Michael Crapo (Sen. Idaho), Jim Inhofe (Sen. Oklahoma) and Deb Fisher (Sen. Nebraska) and Democrats Cory Booker (Sen. New Jersey), Sheldon Whitehouse (Sen. Rhode Island) and Hillary Clinton (former Sen. New York). Additionally, there are more than 40 organizations listed on Wikipedia’s Pro-Nuclear Movement page that are explicitly pronuclear including several new organizations that were founded specifically to draw attention to the need for nuclear power in the era of climate change, including Environmental Progress, Mothers for Nuclear, and Generation Atomic.
In opposition: most fossil fuel and heating oil companies and their institutes, think tanks and lobbyists, including those for natural gas suppliers (since nuclear is their only clean energy competitor). Pretty much all of mainstream environmental groups not run by scientists but rather only activists, such as the Sierra Club, EDF, Friends of the Earth, Greenpeace and 350.org, continue to oppose nuclear based upon historical antinuclear positions taken, the fear of which helped them garner widespread support.