Greenpeace uses tactics of non-violent direct action and 'bearing witness' to draw attention to what it considers significant threats to the environment, and then lobbies for solutions.

[5] Greenpeace and members of the Great Australian Bight Alliance assert that the risk of a spill and presence of the industry in the region poses an unacceptable threat to the environment and livelihoods of local communities.

[6] Campaign activities have centred around promoting South Australia's investments in renewable energy, raising awareness of the perceived risks and supporting grassroot opposition movements within the region.

[7][8] As part of their objective to create a coal-free future and protect the Great Barrier Reef, GPAP joined the Stop Adani movement.

[13] In July 2019, over 500 protesters gathered at the Brisbane Square with the aim to 'stop the city' demanding the state government to revoke the approval of the mine.

[17] Prior to that, following immense public pressure, in August 2017, the Commonwealth Bank ruled out Adani's coal mine project in the Galilee Basin threatening the Great Barrier Reef.

After the two severe coral bleaching in the Australian summer of 2016 and 2017,[19] GPAP has strengthened its opposition to the expansion of the coal industry in Australia and advocated for a transition to renewable energy.

In 2011, after plans became publicly known, GPAP fronted efforts to expose the perceived risk that mining prospects in the Galilee Basin posed to reef health, and has campaigned on the issue since.