The Prometheus Tree in Nevada was nearly 5,000 years old when it was cut down. It could have lived a lot longer.
In Arizona, three native chub species were reclassified as one, raising concerns about the management of the species.
Environmental DNA surveys found higher diversity of clams and mud-dwelling species in populated Puget Sound.
Ocean acidification, driven by global fossil fuel emissions, is being exacerbated by local pollution.