Turning off power is a last-ditch strategy for utilities to reduce the risk that their systems could spark wildfires. In most states, deciding whether to take that step is up to utilities.

Misleading potency labels can disrupt medical dosages, misguide recreational users and erode trust in the industry.

Whether you’re ascending to high altitudes for casual travel or for adventure tourism, there are specific strategies to help you acclimate and reduce the likelihood of altitude sickness.

A hot, dry summer on the heels of a wet winter raises the risk of wildfires.

Standards are vague, and the IRS, which is tasked with enforcement, hasn’t provided much oversight.

Wildfire smoke, even from fires far away, carries potentially harmful gases that, once inside, tend to stick around. An air quality specialist offers an easy, cheap, effective way to deal with it.

Fires in Canada have sent smoke across several US states, leaving cities like Denver with some of the worst air quality in the world – even far from the actual flames.

Fires here can affect meltwater timing and water quality, worsen erosion that triggers mudslides, and much more, as two scientists explain.

Reservoirs and streams are in good shape in California and the Great Basin, but groundwater and ecosystems are another story. And then there’s the Colorado River Basin.

Less than a century ago, Colorado hunted, trapped and poisoned all the wolves within its borders. Today it’s restoring them – a change that reflects a profound shift in human thinking.