The source of water on Earth, the Moon and planets in our solar system is hotly debated. Some in the planetary science community argued that it came from asteroids and comets. Now they have proof.
Old man (possible self-portrait) and water studies, c 1508-9.
Wikimedia Commons
Hydrogen is the first element in the periodic table and essential for life on Earth. It may also be key to shifting away from fossil fuels toward clean sources of energy, but challenges remain.
Zambezi river delta, snapped by Landsat 8 in March 2018.
NASA
Satellites hundreds of miles overheard are helping scientists to predict drought, track floods and see how climate change is changing access to water resources.
Dams, like the Kariba between Zambia and Zimbabwe, regulate flow for irrigation, hydropower and water supply.
ATEC-3D
The Murray-Darling is not just a food bowl, yet the South Australian Royal Commission has found the Murray-Darling Basin Plan is failing its mission to protect the environment as well as irrigators.
Plants can find it tough to get all the nitrogen they need, especially from Australian soils. But summer storms can provide an added boost.
Chemicals poured down the sink or pumped into the atmosphere can eventually end up in the groundwater, which means less available fresh water for us to use.
Flickr/Kamil Porembiński
While making small volumes of pure water in a lab is possible, it’s not practical. The reaction is expensive, releases lots of energy, and can cause really massive explosions.
Going all the way back: rules for the Murray Darling Basin are in Australia’s constitution.
KnitSpirit/Flickr
Professor of Civil, Environmental & Ecological Engineering, Director of the Healthy Plumbing Consortium and Center for Plumbing Safety, Purdue University
Professor in Practice on Environmental Innovation, School of Social and Environmental Sustainability, University of Glasgow, UK, National University of Singapore
Associate Professor of Environmental Economics and Policy, School of Environment, Science and Engineering, and Fellow of the Marine Ecology Research Centre, Southern Cross University