The Prometheus Tree in Nevada was nearly 5,000 years old when it was cut down. It could have lived a lot longer.
Researchers and citizens are rushing to back-up government data on climate change and other issues, fearing political interference.
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.