Medindia: If anyone had any doubts over the adverse impact of global warming, Australia should serve as sufficient warning, say experts. Drought, fires, killer heat waves, wildlife extinction and mosquito-borne illness — the things that climate change models are predicting have already arrived there. Farmers of the Murray-Darling Basin, who once grew 60% of the nation’s produce, are walking off their land or selling their water rights to the state and federal government. Frank …