A new study reveals that air pollution from industrial sources increases levels of five different stress hormones.

Not only that, they’re giving each other tips on how to get away with it.

Lady Liuwa, the lonely lioness who spent more than a decade as the last of her kind in Zimbabwe’s Liuwa Plain National Park, has died of natural causes on the eve of World Lion Day. A survivor of poaching and illegal trophy hunting, Lady Liuwa wandered the park by herself from the late 1990s until 2010, when the first of several companions were successfully transported to Liuwa. Alas, the story since then remained full of near-constant tragedies, but also some hope. Lady Liuwa never bred, but her impact continues with efforts to restore the once-ravaged park. African Parks has the history and a tribute to this resilient big cat. 

Tigers aren’t sexy, especially if you're posing with one in captivity.

The federal Court of Appeals this week reinstated Endangered Species Act protection for the gray wolf populations in the Great Lakes region, vacating a previous decision by the U.S. Fish and Wildlife Service. The court ruling says the previous decision did not take into account the potential impact on other wolf populations, a decision which could have implications for other species sub-populations or “distinct population segments” which have similarly lost protections. 

This month brings books about killer fires, strange birds and wicked bugs.

Fossil fuel development companies have abandoned their leases on more than 1 million hectares of oil sands in northern Alberta. The areas have become less desirable (and less profitable) following the worldwide plunge in crude oil prices. Even the infamous Keystone XL pipeline — which President Trump approved almost as soon as he took office — now seems to lack the necessary support for its construction. What could replace it? Oh, maybe a little thing called solar power. 

We’ll use 1.7 Earths’ worth of resources this year. Can six pledges make a difference?

Why are government contractors clearing trees on a private Texas butterfly sanctuary?

Just two weeks after France said it will no longer allow the sale of gas- and diesel-powered autos after 2040, the United Kingdom has followed suit. In addition, the UK announced it is also exploring ways to tax the dirtiest vehicles on the road as a way to lower current air pollution levels in the most-affected local areas. About half of all cars registered in the UK each year are diesel-powered; electric and hybrid vehicles, although a growing market, still represent a tiny fraction of all new cars sold there. Experts predict that should start to shift in the mid-2020s as prices become more competitive.