Firefighters and locals battle blaze as fires sweep northern Portugal

Thousands of firefighters continue to battle wildfires in Portugal that have killed seven people and burnt more land in a matter of days than the rest of the summer combined.

Scientists say that fossil fuel emissions are worsening the length, frequency and intensity of heatwaves across the world.

The rising temperatures are leading to longer wildfire seasons and increasing the area burnt in the flames, according to the United Nations Intergovernmental Panel on Climate Change.