By Guillermo Martinez JERTE, Spain (Reuters) -Authorities across southern Europe battled on Sunday to control huge wildfires in countries including Spain, Greece and France, with hundreds of deaths blamed on soaring temperatures that scientists say are consistent with climate change. In Spain, helicopters dropped water on the flames as heat above 40 Celsius (104 Fahrenheit) and often mountainous terrain made the job harder for firefighters. Shocked residents watching thick plumes of smoke rising above the central western Jerte valley said the heat was making their previously green and cool hom…