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Need a handkerchief? Num LP Photo/Shutterstock

Why do onions make you cry?

Like many plants, onions have defenses to ward off creatures that may want to eat them. Their secret weapon is a kind of natural tear gas.
Want cleaner air? Stop leaving your car engine running while you’re stopped at lights or waiting for a passenger, and demand better regulations from the government. AAP Image/Dean Lewins

Australia needs stricter rules to curb air pollution, but there’s a lot we could all do now

Australia needs stronger policy aimed at curbing air pollution, but the options currently on the table fall short. For now, we could all aim to drive less and turn off the engine when the car is idle.
Conditions in Belize are affected by emissions thousands of miles away. Brad Herman

Air pollution from Europe and America is making the tropics drier

Air pollution pumped out by factories and power plants in Europe and North America has led to drier spells in the tropics, thousands of miles to the south. Scientists had long suspected this was the case…
Pollution face masks are not just for China. Dave Thompson/PA

Air pollution is not yet a thing of the past

It may seem odd for the European Commission to declare 2013 the “Year of the Air” in order to focus on improving air quality standards. Most would feel air pollution is a problem that has been more or…

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