The greenest option might be to get a disposable bottle but never dispose of it.
We all know that tap water is better than buying bottled water, from an environmental standpoint at least. But what should you drink it out of? A single-use bottle, used multiple times, might be best.
Fish are a key food source for millions of people worldwide. But a recent study finds long-term warming over the next 200 years could starve tiny plankton, with impacts that would ripple up food chains.
Ipswich Council has stopped recycling and it's likely that others around Australia will follow suit.
The 2016 bleaching event resulted in 30% mortality on the Great Barrier Reef, with many corals dying of the heat before they bleached and the loss of branching corals creating less complex reef structure.
Until now, the international shipping industry has been excluded from the Paris Agreement and the Kyoto Protocol, despite its major contribution to global emissions.
State energy ministers meet this week to discuss the National Energy Guarantee. While the policy has been criticised as too modest, it would put us light years ahead of the previous climate policy paralysis.
Sea otters can break the shell on a shellfish by hitting it against a stone resting on their belly. This can look like clapping. Some even have a favourite stone they carry around in their armpits.
The ecological health of New Zealand's lowland rivers and lakes is in decline, but principles borrowed from drinking water safety could help reverse the degradation.
Electric cars might be a quick fix to clean up transport, but the problems with cars go beyond just emissions.
New research shows that fire follows fire in the Australian Alps, and old-growth forests are less flammable.
Just because something is advertised as 'flushable' doesn't mean you should put it in your toilet.
Will the renewable energy transition end up creating yet more greenhouse emissions, as we ramp up the manufacture of wind turbines and solar cells? Not if their manufacture is itself powered by renewables.
AGL has announced plans to use coal to make hydrogen fuel at its Loy Yang A station in Victoria's Latrobe Valley. Wait, isn't coal made of carbon, not hydrogen? Yes, but here's how the process works.
The maritime pollution that drifts to dry land, causes an estimated 400,000 premature deaths and 14 million cases of childhood asthma each year.
New Zealand has ruled out new permits for offshore oil and gas exploration as a step towards a transition to a carbon-neutral future.
Record-breaking April heat is likely to continue for at least another month.
An annual assessment of the health of Australia's environment shows mostly stable conditions in 2017, but ecosystems on land and at sea suffered ever higher temperatures.
The noise from motor boats, sonar and other industrial activity interferes with the underwater chatter of fishes.
Footage of sheep transport conditions have shocked many, but live export has a long history in Australia.
Every year councils around Australia compete to prove they have the best-tasting tap water in the country.
Across large ares of Australia, rocky outcrops are being obliterated to open up more land for farming. But many of these "bush rocks" are refuges for fragile ecosystems.
Government pressure on AGL to keep its Liddell power plant open past 2022 ignores the sensible, cost-effective plan to replace it.
A proposal that all imported vegetable seeds be treated with fungicide has drawn outrage from Australia's organic producers, who fear losing their certification.
With coral reefs in crisis around the world, many organizations are working to restore them by growing and transplanting healthy corals. A new study spotlights techniques that help restored reefs thrive.
Rhino resurrection is tempting, but if humans cannot save a species in nature, what future for animals that we manufacture?
Dogs don't follow the rules on larger animals living longer. A 70kg Great Dane is lucky to reach seven years, but a 4kg Chihuahua can live for 10 years or more.
Proposed changes to the government's climate change policies may stall, or even close down, the market for 'carbon farmers' to profit from reducing carbon dioxide emissions.
Solar photovoltaics and wind power are on track to supplant fossil-fuel-based electricity generation by the 2030s. The only thing holding back the renewable revolution is politics.
In the aftermath of fires or logging, conservation needs to focus on recovering the health of the remaining vegetation, not just the size of the forest or woodland.
It's understandable to want to shield children from the impacts of disasters. But research suggests that they should be given a voice in disaster planning and a role in reducing the risks.