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The United States and other countries have hiked their targets for slashing greenhouse gas emissions at a global climate summit hosted by President Joe Biden.
Mr Biden unveiled the goal to cut emissions by 50-52 per cent from 2005 levels at the start of a two-day climate summit kicked off on Earth Day and attended virtually by leaders of 40 countries including big emitters China, India and Russia.
Resisting pressure, Prime Minister Scott Morrison told the summit Australia was focused on the "how" of reducing emissions, rather than new targets.
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The US, the world's second-leading emitter after China, seeks to reclaim global leadership in the fight against global warming after former president Donald Trump withdrew the country from international efforts to cut emissions.