But environmentalists said the plan from Prime Minister Malcolm Turnbull’s government was nowhere near enough. The reef’s health and prospects are increasingly grim. Huge sections stretching hundreds of miles across have died over the past two years, killed by overheated and more acidic seawater caused by climate change.

This month, scientists declared that much of the damage was irreversible, and said the only solution was a global one: Reduce greenhouse gas emissions and the use of fossil fuels, and get climate change under control.

“Science is well aware of what is killing coral on the Great Barrier Reef — it’s the excess heat that comes from burning fossil fuels,” said Bill McKibben, an American environmentalist, author and founder of 350.org, which aims to rapidly end the use of fossil fuels. “If the Turnbull government was serious about saving the reef, they would be willing to take on the industry responsible for the damage.”

Critics seized on Australia’s continued subsidized development of gas and coal, especially its openness to the Adani coal mine in northern Australia that would be among the world’s largest, pushing coal on boats running near the reef. The plan still awaits final approval.