Four major heat waves, dry conditions and strong winds have turned Europe into a tinderbox this summer, fueling the most destructive wildfire season in nearly two decades.

A fourth person died as wildfires blaze on in Spain and parts of Europe worsened by sweltering heat fueled by effects of climate change. Spain's weather agency, Aemet, warned the public on Monday to be "cautious" of the "very high or extreme fire danger" in most of Spain as it reported high 108 degree Fahrenheit temperates on Sunday in Cadiz in the southern tip of Spain only miles to the Strait of Gibraltar.

Spain deploys 500 additional soldiers to fight devastating wildfires as extreme heat fuels blazes across Europe.