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US scientists announced a breakthrough on fusion energy on Tuesday (Dec 13), potentially a step toward one day harnessing the process that fires the sun to generate carbon-free electricity as the world with climate change. So, will fusion help fight climate change? Potentially. Besides vastly up the energy from fusion reactions, scientists need to produce them multiple times per second on a constant basis. Scaling that process up to a power plant and building plants big enough to cover a significant chunk of the world's growing electricity demand would take efforts requiring materials, land and clear regulations for industry. Politicians supporting the existing fuels and infrastructure may be to rapid change. As the quest for fusion energy develops over a decade or potentially much longer, countries should continue aggressive moves into wind and solar power, energy storage, including batteries, next generation fission power and other alternatives to reduce on fossil fuels, scientists and environmentalists say.