A pattern is left by forest fire as seen in this photograph of a mountain in Yoho National Park in British Columbia west of the Alberta border in this August 8, 2005 file photo. The fire was a controlled burn of forest areas infested with the mountain pine beetle. The pine beetle epidemic has killed millions of trees and affected some seven million hectares of forest in the province. Tree-munching beetles, malaria-carrying mosquitoes and deer ticks that spread Lyme disease are three living signs that climate change is likely to exact a heavy toll on human health. To match feature HEALTHCARE-CLIMATE/
REUTERS/Andy Clark/Files (CANADA ENVIRONMENT)