A G20 declaration on Wednesday said "we will play our part fully in implementing" last year's Glasgow Climate Pact, under which countries pledged to limit the rise in global temperatures to 1.5C above pre-industrial times.
"As things stand, the Glasgow Climate Pact is broken, but the G20 have the opportunity to fix it."
MISSED OPPORTUNITYThe G20 declaration recognised the need to phase down use of unabated coal and phase out "inefficient" fossil fuel subsidies.
Avinash Persaud, special envoy on climate finance to Prime Minister Mia Motley of Barbados, meanwhile, told Reuters the G20 declaration missed the mark on finance.
"Unfunded ambition gets us nowhere fast," Persaud said, adding he wanted G20 countries to unlock more lending from multilateral development banks they control to help climate-vulnerable countries.