EXPLAINER: What's behind Europe's spate of deadly wildfires?

LISBON, Portugal (AP) — Major wildfires in Europe are starting earlier in the year, becoming more frequent, doing more damage and getting harder to stop.

And, scientists say, they’re probably going to get worse as climate change intensifies unless countermeasures are taken.

A mass migration of Europeans from the countryside to cities in recent decades has left neglected woodland at the mercy of the droughts and heat waves that are increasingly common amid global warming. One tiny spark can unleash an inferno.

Fighting forest fires in Europe has never been so hard. Here’s why:

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WHAT’S CAUSING EUROPE’S WILDFIRES?

The continent’s so-called rural exodus since the second half of the last century, as Europeans moved to cities in search of a better life, has left significant areas of countryside neglected and vulnerable.

Woodland is littered with combustible material, says Johann Goldammer, head of the Global Fire Monitoring Center, an advisory body to the United Nations. That includes things like dead tree trunks and fallen branches, dead leaves and desiccated grass.

“This is why we have unprecedented wildfire risk: because never before in history — say, the last 1,000 or 2,000 years — has there been so much flammable material around,” he said.

He adds: “The landscape is getting explosive.”

Carelessness with naked flames is often enough to ignite a wildfire. In Portugal, where more than 100 people died in wildfires in 2017, authorities say 62% of outbreaks stem from farming activities such as burning stubble.

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IS GLOBAL WARMING A FACTOR IN THE WILDFIRES?

Climate change has added a scary new dimension to wildfires and made them more menacing.

That is especially true in southern Europe, where the increasing occurrence...