BBC: the once-lush fields of South Australia, on land that borders the state’s world famous Lower Lakes, farmer Nigel Treloar rounds up the herd with the help of his off-road motorbike. It is one of the few things that has got easier as a result of Australia’s worst drought in 100 years. That is because he used to have 800 cows and now he only milks 250. There is not enough irrigation water from the nearby lakes to sustain a bigger herd. Lake Albert’s waterline has receded, leaving …