Angus McLarena, a grains farmer, looks at his failed wheat crop on his farm near the town of West Wyalong in this October 17, 2007 file photo. If farmers think they have a tough time producing enough rice, wheat and other grain crops, global warming is going to present a whole new world of challenges in the race to produce more food, scientists say. Picture taken October 17, 2007. To match feature FOOD-CLIMATE/ REUTERS/Mick Tsikas/Files (AUSTRALIA)
REUTERS/MICK TSIKAS