Prime Minister Scott Morrison says he will not be dictated to by other governments' climate change goals, declaring he is not worried about the future of Australia's exports despite four of the country's top trading partners adopting net-zero emissions targets.

China, Japan, Britain and South Korea, which account for more than $310 billion in Australian annual trade between them, have all now adopted the emissions target by 2050 or 2060, ramping up pressure on Australia's fossil fuel industry. Coal and natural gas alone are worth more than 25 per cent of Australia's exports, or $110 billion each year.

"I am not concerned about our future exports," Mr Morrison said on Wednesday. "Australia will set our policies here. Our policies won't be set in the United Kingdom, they won't be set in Brussels, they won't be set in any part of the world other than here."

As the Prime Minister spoke in Canberra, the South Korean President Moon Jae-in was addressing his own parliament in Seoul announcing his country would also pursue a net-zero target by 2050.

Guest post from The Sydney Morning Herald