Rancher blames global warming on Grizzly attack.
Two notes to that unfortunate rancher. First, if you live in Griz country, it is intelligent to be armed, on a horse, or in a vehicle. If hiking, at least make plenty of noise to warn them away. When we have hiked in a Griz preserve in Montana, we clap our hands and talk loud. Some hikers bang on pots, some use Bear Bells.
Second, Grizzly Bears are not mountain creatures at all. They are primarily creatures of the lowlands, especially river valleys and foothill marshes with the succulent vegetation they like to graze on. In berry season, they will go into the hills but not the mountains. Historically, they were common on the Great Plains of the US as far east as Ohio. They are not really predators except to fish, young helpless mammals, and anthills, but people can piss them off sometimes. They do not like to be bothered. Who does? They are powerful and fast and meat is a rare dessert for them.
When they are in forest or mountains, they are remnant refugees from their preferred habitat, trying to survive in marginal areas.
Rule of thumb: Never surprise a Griz.