By Katharine Houreld DOLLOW, Somalia (Reuters) -Each morning in this Somali border town, 11-year-old Bashir Nur Salat plots his day’s mission behind a crooked wire fence. Armed with only a friend’s yellow school shirt, a borrowed book and toothy grin, he eyes his prize through the mesh: lunch. Bashir lives where three crises converge – global warming, spiralling food prices and war. He, like millions of others in Somalia, are in the crosshairs of what some aid workers are calling the “The Three Cs”: climate change, costs and conflict. The worst drought in four decades in war-torn Somalia force…