The granting of a mining lease to the Carmichael coal project, despite the huge potential greenhouse emissions, shows that ministers need to consider the wider consequences of their approvals.
Carbon dioxide is rising faster than any time in the past 66 million years. Rapid rises in the past have been linked to mass extinctions.
Australia still rests too heavily on its luck, and not enough on its brains.
Eating meat means greenhouse emissions. But the emissions from growing crops may have been underestimated, meaning that a climate-friendly diet isn't as straightforward as simply going vegetarian.
Eating less meat isn't the only solution to reducing greenhouse gas emissions from livestock.
Fossil fuel emissions are slowing, but another major climate problem is becoming clear: food production.
Methane is a stronger greenhouse gas than carbon dioxide, and Australia's coal mines are a major source.
There's enough water under the ground to form a lake 100m deep over the earth.
The Paris agreement has given us some solid targets to aim for in terms of limiting global warming. But that in turn begs a whole range of new scientific questions.
Governments and the aviation industry have welcomed new proposed aircraft emissions standards - which rather suggests that the new rules don't go far enough.
The countries that have contributed the least to climate change will experience the worst of its effects.
Australia's greenhouse emissions are once again rising, after a decade of consistent declines. But the right policies are already in place to turn things around - they just need to be ramped up.
How will the world actually deliver on the Paris climate ambition to hold global warming to no more than 1.5℃? It's a tough scientific and technical challenge.
The Paris deal has laid the foundations for real global progress on climate change. On that score, it must be judged a huge success.
The Paris climate summit yielded a pact to reduce air pollutants that contribute to global warming but missed a chance to address the interlinked effects of agriculture and climate.
The Paris Agreement is an extraordinary achievement. But there is much work to be done to ensure global warming does not exceed dangerous levels.
The Paris climate agreement doesn't specifically address cutting down on coal, but the tide is turning against coal mining anyway.
There's a huge gap between what India claims it can do, and what it's actually doing to bring down emissions.
A new bid to boost the amount of carbon stored in the world's soils has been launched at the Paris climate summit.
The greenhouse gases that cause climate change will take centre stage at the upcoming Paris climate talks. What are they and what are their effects?