The federal environment minister, Murray Watt, has pledged to put an extra half a million square kilometres of Australia’s ocean out of reach of fishers and drillers in a step conservationists hope will “right the wrongs” of an Abbott-era downgrade of marine protection. Watt confirmed last year Australia would put 30% of its ocean estate under a high level of protection that bans extractive industries as part of an international agreement to protect 30% of the planet’s oceans.