Hangovers result from a classic human failing: we stop and think only when a problem arises, not when it’s caused. When times are good, we’ve always got room for one more, but come the morning and we’ll be wondering why we partied like there was no tomorrow. Today, there’s plenty to drink in Australia. The rains are here, and the east and west coasts received prodigious downpours in spring. Times are good—which means the last thing on our minds is a hangover. But a little over a year ago, half the country was on fire, crops had failed and rivers were dry. At the time, the government said it couldn’t make it rain to fix the problem. Now that the rains are here, it’s time to prepare for the next catastrophic drought. But to do that we need to embrace water security as a core national security issue.