Worst coral bleaching on record for Western Australian reefs

Watch: Can you un-bleach coral? BBC visits remote Australian reef to find outWorld-famous coral reefs along Western Australia's (WA) coast have suffered the worst bleaching on record after the state's "longest, largest and most intense" marine heatwave, scientists say.Between last August and this May, warmer water temperatures led to significant heat stress on the reefs, causing many of the coral to expel the…