Reuters: The prolonged drought in Australia’s Murray-Darling river system is worsening and the country’s main food bowl may forever be changed by accelerating climate warming, government officials said on Thursday. The drought will hit irrigated crops like rice, grapes and horticulture the hardest, but would have less impact on output of wheat, which depends largely on rainfall during specific periods and is on track to double after two years of shrunken crops. “Regrettably, the drought …