TOKYO - The United States and Japan said they had agreed at a summit on Friday to expand cooperation in clean energy technologies in an effort to tackle climate change.

The two sides would work together in areas such smart grids, carbon capture and storage and nuclear energy, the two governments said in a joint statement after talks between U.S. President Barack Obama and Japanese Prime Minister Yukio Hatoyama in Tokyo.

Tokyo and Washington will aim to reduce their own greenhouse gas emissions by 80 percent by 2050 and back a global goal to halve emissions by mid-century, they said.

(Reporting by Chisa Fujioka)