All of the following is leading to less habitable land for human populations except fewer wildfires. A wildfire can burn a natural area.
A wildfire is a fire that can burn an entire natural area (e.g., forest, grassland, prairie, etc).
Wildfires are generally due to anthropogenic (human) unconscious activities, but they can also be natural (for example, wildfires caused by lightning).
It has been proposed that when considering the total surface area burned at the global Earth level, wildfires declined over the last decades.
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