Nearly two dozen groups of experts and citizen scientists explored trails, parks and wilderness areas to document biodiversity in Arizona's borderlands region.
The heavy California wet seasons of 2016 and 2017 brought flooding to the drought-stressed state, but still failed to dampen its disastrous wildfire season.
As Colorado River states move closer to finishing the Drought Contingency Plan to boost Lake Mead, the federal government is moving forward on a parallel track.
Three buckets of uranium ore stored for years in a building at the Grand Canyon probably didn’t endanger visitors or park workers, scientists say, but a few other questions remain.
It won’t come cheaply, but the costs of incentives and infrastructure could actually be less than the environmental and health costs of the status quo.