(CNN) -- Four top environmental scientists raised the stakes Sunday in their fight to reverse climate change and save the planet.

Climate and energy scientists James HansenKen CaldeiraKerry Emanuel and Tom Wigley have released an open letter calling on world leaders to support development of safer nuclear power systems.

Wait -- pro-nuclear environmentalists? Isn't that an oxymoron? Apparently, not so much anymore.

Embracing nuclear is the only way, the scientists believe, to reverse the looming threat of climate change which they blame on fossil fuels. Depending who you ask, they're either abandoning -- or leading -- traditional environmentalists who for a half-century have rejected clean-burning nuclear power as too expensive or too dangerous. Opponents cite disasters at Fukushima, Chernobyl and Three Mile island.

By Thom Patterson

Read full article on CNN