The Doomsday Clock has moved forward to 100 seconds to midnight - but this is a publicity stunt, not an actual scientific measurement.

Scott Morrison needs to raise Australia's long-term emissions targets to be aligned with Liberal states and conservative governments overseas, writes the director of the Grattan Institute’s energy program, a former executive at Origin Energy.

The threat of mass fish kills is emerging across the river system as ashy sludge with "the consistency of cake mix" moves downstream.

Juvenile crown-of-thorns starfish can live for years on a bleached reef eating algae before attacking when the coral returns, a study has found.

Bosses have told brigades to prioritise burns that benefit the wider community and they must work under new hygiene requirements.