Washington | The Biden administration is nearing agreements with Japan, South Korea and Canada to bolster carbon emission reduction targets in all four countries ahead of a closely watched summit of global leaders on Earth Day, April 22.

But in the latest sign of how difficult it will be for President Joe Biden to make climate change a core part of his foreign policy, similar deals with China, India and Brazil, economic powerhouses that together produce more than a third of global emissions, remain elusive.