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2024年4月2日 · A wildfire is an uncontrolled burn of vegetation, which includes the burning of forests, shrublands and grasslands, savannas, and croplands. Wildfires can be caused by human activity — such as arson, unattended fires, or the loss of control of planned burns — and natural causes, such as lightning.
2023年10月19日 · Worldwide, wildfire smoke kills 339,000 people a year, mostly in Asia and sub-Saharan Africa, according to estimates. Tenfold increases in asthma attacks, emergency room visits, and hospital admissions have also been reported when smoke blankets the
2023年10月19日 · Vocabulary. A wildfire is an uncontrolled fire that burns in the wildland vegetation, often in rural areas. Wildfires can burn in forests, grasslands, savannas, and other ecosystems, and have been doing so for hundreds of millions of years. They are not limited to a particular continent or environment.
Wildfires are often classified by characteristics like cause of ignition, physical properties, combustible material present, and the effect of weather on the fire. [5] Wildfire behavior and severity result from a combination of factors such as available fuels, physical setting, and weather.
2022年3月9日 · Record-breaking temperatures in 2021 increased the frequency and intensity of wildfires and their associated risks to human and environmental health, according to Spreading like Wildfire, a new report from the United Nations Environment Programme (UNEP
A wildfire is an unplanned fire that burns in a natural area such as a forest, grassland, or prairie. Wildfires are often caused by human activity or a natural phenomenon such as lightning, and they can happen at any time or anywhere.
2024年4月4日 · Metrics. Wildfires burned 384 Mha of land in 2023, the highest since 2017 but 5% lower than the 2001–2022 average. These fires emitted an estimated 2,524 Tg C, 30% of which came from Canada’s ...
2023年6月9日 · Wildfire activity is increasing across North America, driven in part by hotter and drier conditions over the past century. Climate change is exacerbating the issue, increasing the frequency, severity, and extent of area burned by wildfires, and putting more people at risk of exposure to fire itself and to smoke, which can travel ...
Uncontrolled blazes fueled by weather, wind, and dry underbrush, wildfires can burn acres of land—and consume everything in their paths—in mere minutes. On average, more than 100,000 wildfires...
2016年9月1日 · 在自然环境和城市郊区，完善预防和减少火灾风险的政策需要充分了解驱动野火发生发展的关键因素。野火的形成及其对环境的影响取决于多种因素，如可燃物类型（草、灌木、树木），植被状况（含水量、相对湿度和空气温度、风、地面坡度），土地利用类型（草原、灌木林地、森林、城市周边 ...
