Firefighters have been battling a vast wildfire in the hills above Blaenavon in south Wales, spreading across more than 4,000 hectares, for three weeks. Around 200 military personnel were called in to support exhausted fire crews as more fires broke out across the south Wales valleys. Smoke from Blaenavon could be seen from Cardiff and Gloucestershire. We cannot stop all such wildfires. But it’s possible to make our landscapes more resilient to …