5:15 PM - 7:15 PM
[HGG01-P06] Complex Drivers of Wildfires in California: Climate Change, Agricultural Expansion, and Excessive Water Consumption
Keywords:California , Wildfires, Drought, Agriculture, Water usage
In recent years, California has witnessed a sharp rise in both the frequency and magnitude of wildfires. As of Feb 2025, official reports indicate 51,818 emergency responses, 337 wildfires, approximately 233 km2 burned, 16,244 structures destroyed, and at least 29 fatalities. Notable large-scale incidents include the 2018 CAMP Fire (caused by power lines, with about 620 km2 affected) and the 2025 January EATON (under investigation; approx. 57 km2) and PALISADES Fires (under investigation; approx. 95 km2). Although climate change—particularly rising temperatures and regional aridification—has been frequently cited as a key factor, the escalating number of catastrophic wildfires cannot be fully explained by these elements alone.
This study focuses on agricultural expansion and excessive water consumption as critical drivers of California’s wildfire problem. Over the past two decades, the state’s agricultural export value has grown by a factor of 3.4, with nut exports alone surging by 9.5 times, positioning California as a leading global supplier. This growth has come at the cost of immense water usage, with substantial volumes of “virtual water” effectively flowing out of the state in exported produce. Many regions, particularly the Central Valley—characterized by naturally arid conditions—have seen their surface water resources depleted, prompting heavy reliance on groundwater, which in turn has caused land subsidence and accelerated desiccation. Under such dry and stressed conditions, the risk of wildfire ignition is perpetually high; once ignited, the intense heat generated by these fires produces powerful updrafts, strengthening local winds and fueling rapid fire expansion in a vicious cycle.
It also addresses secondary disasters, such as soil salinization from saltwater-based firefighting and the heightened risk of landslides triggered by minimal rainfall on fire-scorched terrain. Although agencies like CAL FIRE have implemented a range of preventive programs—including the “One Less Spark – One Less Wildfire” campaign, prescribed burns, fuels reduction, and vegetation management—wildfires of significant scale persist, necessitating a thorough examination of these measures’ effectiveness and challenges.
Ultimately, the study aims to propose concrete policy recommendations for more sustainable land and water management, including stricter regulation of large-scale agricultural practices and the bottled-water industry, alongside improved groundwater protection strategies. By shifting the focus beyond climate change alone, this research endeavors to clarify the multi-layered nature of California’s wildfire crisis and offer viable pathways to mitigate future risks.
This study focuses on agricultural expansion and excessive water consumption as critical drivers of California’s wildfire problem. Over the past two decades, the state’s agricultural export value has grown by a factor of 3.4, with nut exports alone surging by 9.5 times, positioning California as a leading global supplier. This growth has come at the cost of immense water usage, with substantial volumes of “virtual water” effectively flowing out of the state in exported produce. Many regions, particularly the Central Valley—characterized by naturally arid conditions—have seen their surface water resources depleted, prompting heavy reliance on groundwater, which in turn has caused land subsidence and accelerated desiccation. Under such dry and stressed conditions, the risk of wildfire ignition is perpetually high; once ignited, the intense heat generated by these fires produces powerful updrafts, strengthening local winds and fueling rapid fire expansion in a vicious cycle.
It also addresses secondary disasters, such as soil salinization from saltwater-based firefighting and the heightened risk of landslides triggered by minimal rainfall on fire-scorched terrain. Although agencies like CAL FIRE have implemented a range of preventive programs—including the “One Less Spark – One Less Wildfire” campaign, prescribed burns, fuels reduction, and vegetation management—wildfires of significant scale persist, necessitating a thorough examination of these measures’ effectiveness and challenges.
Ultimately, the study aims to propose concrete policy recommendations for more sustainable land and water management, including stricter regulation of large-scale agricultural practices and the bottled-water industry, alongside improved groundwater protection strategies. By shifting the focus beyond climate change alone, this research endeavors to clarify the multi-layered nature of California’s wildfire crisis and offer viable pathways to mitigate future risks.