Foreign Minister Julie Bishop says nuclear energy remains an option for Australia, describing it as an "obvious direction" as it considers how to cut carbon dioxide emissions after 2020.

Ms Bishop called for a an open discussion about the feasibility of nuclear power, given Australia's abundance of uranium, but accused Labor of resorting to a scare campaign when the issue was raised during the Howard government years.

Nuclear door re-opened: Foreign Affairs Minister Julie Bishop. Credit:Andrew Meares

"It's an obvious conclusion that if you want to bring down your greenhouse gas emissions dramatically you have to embrace a form of low or zero-emissions energy and that's nuclear, the only known 24/7 baseload power supply with zero emissions," she told Fairfax Media when asked about Australia's options for reaching future carbon-reduction targets.

Ms Bishop flies to Lima, Peru, in just over a week to attend the annual United Nations climate conference, where Australia will face pressure to announce its climate targets for beyond 2020 and it's understood the Prime Minster has personally requested Trade Minister Andrew Robb chaperone Ms Bishop so he can factor in the economic impacts of any new targets Australia considers. Mr Robb, with three major trade deals under his belt, was due to be in South America at the time. Mr Robb was instrumental in influencing the coalition partyroom against former Leader Malcolm Turnbull and his support for Labor's emissions trading scheme.