Japan will give up to $US1.5 billion ($A1.6 billion) to the UN-backed Green Climate Fund, joining a US pledge of $US3 billion to mitigate the impact of global warming on poor nations.
The move was flagged ahead of the summit of G20 leaders in Brisbane, and rubber-stamped in a statement by the White House after US President Barack Obama met Prime Minister Shinzo Abe on the summit sidelines on Sunday.
"Making good on our commitment to support efforts to curb greenhouse gas emissions and build climate resilience worldwide, the United States and Japan announced a total of up to $US4.5 billion in pledges to the Green Climate Fund (GCF)," it said.
The pledges build on those already announced by Germany, France, and other donors.
The UN fund is a way for wealthy countries to help poorer ones to become greener and to bolster their defences against the effects of climate change.
The UN hopes the fund will have $US10 billion worth of commitments by the end of this year.
The Japanese confirmation followed talks with Mr Abe, Mr Obama and Prime Minister Tony Abbott, who's been keen to keep the G20 focused on economic issues.
Climate change appears set to be mentioned in the G20 leaders' final communique on Sunday, after Mr Obama breathed new life into global discussions on greenhouse emissions following a surprise pact with China last week.
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