Europe has been warming twice as fast as the global average since the 1980s, making the region more vulnerable to wildfires.

Scorching heat hampered efforts to contain 20 major wildfires across Spain on Sunday, prompting the government to deploy an additional 500 troops from the military emergency unit to support firefighting operations.

According to the European Forest Fire Information System of the European Union, the fires in Spain this year has burned 158,000 hectares (390,000 acres). That's around the size of metropolitan London.