Associated Press: For centuries, farmers in the fragile ecosystems of the high Andes have looked to the behavior of plants and animals to figure out what crops to grow and when.
If reeds dried up in the late summer, rainless weather lay ahead, they believed. If the Andean fox made a howling appearance, abundant rains were thought sure to come.
But increasingly erratic weather that scientists attribute to global warming is rendering their age-old methods less reliable, endangering harvests in a region where life...