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U researchers found that 1,000 years ago, the Fremont used cultural burning to reduce the risk for large-scale wildfire activity in mountain environments.

Research shows how organic crystals in aerosols can help turn water to ice.

To understand the environmental pressures that shaped human evolution, scientists must first piece together the details of the ancient plant and animal communities that our fossil ancestors lived in over the past 7 million years.

Study finds a link between drought and air quality in the western wilderness.