Atmospheric carbon dioxide measurements at Tasmania’s Cape Grim and Antarctica’s Casy Station have now officially passed 400 parts per million and are likely to stay above that for decades to come.
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.
A carbon tax on airline tickets might sound like a tricky sell, but many airlines already collect a similar levy to raise funds for developing world health initiatives.
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.
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.
Energy companies are realising that, in light of the Paris climate deal, the economics are starting to line up in favour of climate action, not against it.
Governments and the aviation industry have welcomed new proposed aircraft emissions standards - which rather suggests that the new rules don’t go far enough.
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°C? It’s a tough scientific and technical challenge.