Footprints get people thinking about their own impact, but for water the analogy simply doesn't work.
From black coffee to a hair of the dog – here's the science behind popular hangover remedies.
South Africa needs to strengthen its response to plastic pollution.
Research shows that campaigns that try to make consumers feel guilty about the amount they waste often make things worse, not better. A new study poins the way to more effective anti-waste campaigns.
There is something deeply irrational about the food waste movement.
Increased use of renewable energies could help curb climate change, but the water required for their production has dispossessed rural Guatemalans.
The Ogalalla Aquifer is a vast underground lake that irrigates farms across the US Great Plains. It took thousands of years to fill, but human use could drain it in roughly a century.
Yes, it's hot outside. And football practice is starting for thousands of kids. But coaches and parents should be careful about tellings kids to drink more water. That has been deadly.
Researchers have found evidence of a large lake of salty water, buried 1.5 kilometres beneath the southern polar ice cap on Mars. So what does that mean for life on the red planet?
Even a small cloud can weigh as much as four tonnes – but gravity, chemistry and temperature keep them floating in the sky.
Unless African cities improve water management many will face severe water problems by 2035.
Cape Town faced down "Day Zero" earlier this year, but that doesn't mean its water system is resilient. Other cities should also take note.
Energy that otherwise would go to waste might someday power industrial-scale condensation.
An audit of Sydney's drinking water has found worryingly high salinity. If the biggest water catchment in the country has problems, what about regional and rural Australia?
The global population is climbing faster and faster. What will this mean for future generations?
A gardening expert reveals the simple things you can do to protect your garden during a heatwave.
Crop insurance cushions farmers against natural disasters, but it also can lead them to overuse resources and reduce their incentive to adapt to climate change.
In South Africa, Cape Town fears "Day Zero", when the city will have to ration water drastically. The phenomenon threatens other cities as well but solutions exist.
Things and experiences that once seemed so enjoyable usually grow dull over time, something known as hedonic adaptation. Chopsticks offer one way to get some of that pleasure back.
Climate change plus population growth means the city has to act soon.