Climate change has many signals—rising sea levels, melting glaciers, stronger storms—but the first and most immediate sign for most people on the planet is water. Not too much of it. Not too little.

Your correspondent moderated a panel discussion with global experts in desalination, international development, and water economics at the ceremony announcing the teams that had qualified for the ...

California doesn’t have a water scarcity problem. It has a distribution problem, according to Nícola Ulibarrí, whose new research is reshaping how policymakers think about one of the state’s most ...