The 2018 State of the Climate report, released yesterday, again highlights the risk to human wellbeing from our love affair with fossil fuels. Coal, oil and gas have underpinned the incredible advances in affluence, population size, and health since development of the steam engine. But fossil fuel use has an optimum dose, which is now well past.

We are metaphorically drowning in carbon dioxide, the invisible, odourless waste product of burning fossil fuel. As the report notes, this is increasing heatwaves, acidifying the oceans and raising the sea level. It is also lowering the micronutrient concentrations of food.

An evacuation during the November bushfires, near Mount Larcom, Queensland. Credit:AAP

The report cites growing effects on human and animal health, including from increased fires and flooding, and says extreme heat days are rising alarmingly. This month, dozens of Australians were rescued from the Hume Highway, stranded by intense rainfall. Record heat and fire ravaged north Queensland. A third of the spectacled flying fox population died from heat, possibly exposing animal rescuers to viral diseases.

In November, San Francisco air was worse than Delhi, due to fires that ruined the Californian city of Paradise, recently home for 30,000 people.