A new nuclear energy deal between the U.S. and Brazil got lost in the shuffle this week, as the White House sought instead to play up a pledge between the two countries to increase renewable energy.

Nevertheless, the two countries did also agree to collaborate on nuclear energy development as part of a broad plan to address global warming agreed to earlier this week in Washington.

The new agreement between the two nations comes as nations prepare for international negotiations on climate change later this year in Paris, in which Obama wants Brazil's support to reduce emissions from fossil fuels.

It is likely nuclear energy will have to be part of any emission reduction strategy, but it was unclear why the administration was so coy in discussing it in announcing the new cooperation.

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