"Nangs" are cheap, legal and easy to get - but like most drugs, they are also highly dangerous.
Anabolic steroids and nitrous oxide are on the up and up.
While the gases most responsible for global warming - carbon dioxide, methane and nitrous oxide - continue to climb, other industrial greenhouse gases are being brought gradually under control.
The ACCC has launched proceedings against VW for allegedly misleading consumers. But consumers won't be directly compensated from the case.
From medical use to getting high on balloons, nitrous oxide is in popular demand.
To meet global climate change targets, agriculture needs an array of innovations and money to get farmers around the world to adopt new practices.
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.
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 greenhouse gases that cause climate change will take centre stage at the upcoming Paris climate talks. What are they and what are their effects?
About 10% of human-generated greenhouse gas emissions come from farming. Researchers are working on ways to address this piece of the global warming puzzle.