Europe's Wildfire Crisis
High temps (37°C) sparked fire in peat bogs, making it hard to extinguish.
Wallonia spokesperson said fire isn't contained.
500 firefighters from Belgium, Germany, Luxembourg, and EU aircraft fight the blaze.
Europe's fires killed 20, burned 576,000 hectares (twice Luxembourg's size).
Climate change causes extreme fire risk in Europe.
90% of wildfires are human-caused, worsened by rural abandonment.
20 hours ago