After declining for nearly a decade, the number of hungry people in the world is growing again. Climate change, which is disrupting weather patterns that farmers rely on, is a major cause.
Energy-efficient water supply is a wicked problem – and we might have found a way to solve it.
If you have to devote hours a day to collecting water, you miss out on education, a social life and other human rights.
When people form local networks to take care of resources such as drinking water, they strengthen their communities. Technology can support these efforts and promote learning and innovation.
On the outskirts of Bangalore, families must piece together drinking water from communal supplies, intermittently available tap water, and "water ATMs".
Dairy cows are sensitive to heat, so farmers cool them down with sprinklers and fans. Researchers are designing better, more efficient systems to keep cows comfortable through hot California summers.
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.
Deputy Prime Minister Michael McCormack has suggested changing the rules to allow 'environmental' water to be diverted to drought-hit farms. But the idea would be far less straightforward in practice.
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.
New Zealand is home to more seabirds than any other country, and many species are already under pressure from climate change and over-fishing. Plastic pollution could push some closer to the brink.
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.