Rapid expansion of wildland-urban interface linked to wildfire risks worldwide study finds

Rapid expansion of wildland-urban interface linked to wildfire risks worldwide study finds
by Simon Mansfield
Sydney, Australia (SPX) Nov 16, 2024
The rapid spread of human development into natural landscapes has significantly expanded the wildland-urban interface (WUI), increasing wildfire risks globally, a recent study indicates.

A team led by Prof. WANG Jianghao at the Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, analyzed changes in global WUI from 2000 to 2020. Their findings highlight a marked increase in WUI areas, raising concerns about intensified wildfire threats.

This research, featured in 'Science Advances', emphasizes how urbanization can exacerbate wildfire dangers for communities. Industrial growth and human activities have converted significant portions of natural land into WUI regions, where the interaction between human presence and the Earth's natural systems heightens exposure to hazards such as wildfires, floods, and landslides.

Prof. WANG commented, "The increased occurrence of extreme and large wildfires, exacerbated by climate change, necessitates urgent attention to these hazards in WUI areas."

Living in or near WUI zones carries higher mortality risks due to proximity to flames and heat. Additionally, wildfire smoke can cause health issues even as far as 1,000 kilometers away. This makes understanding WUI growth dynamics essential for crafting effective wildfire management strategies.

By 2020, WUI areas spanned 1.44% of the Earth's land surface, home to roughly 1.2 billion people. Between 2000 and 2020, WUI regions grew by over 33%, with the majority (85%) of the expansion occurring between 2010 and 2020. Urban growth was identified as the main factor driving this expansion, with changes in vegetation playing a minor role.

The team's spatial analysis showed that wildfires near WUI areas are common but often less intense, suggesting that WUI zones are fire-prone. Between 2010 and 2020, small fires within 1 km of WUI areas increased, while fire activities at distances beyond 3 km diminished, likely linked to rising human activity.

The study underscores that urbanization has played a major role in WUI expansion, directly contributing to greater wildfire risks for affected populations.

Research Report:Global expansion of wildland-urban interface intensifies human exposure to wildfire risk in the 21st century