The environment of the wolf can range from colder places such as Alaska, to warmer places like desserts. Most of the populations of pure wolves today live in the colder areas of the world, where there are less humans to bother them.
Wolves are very social creatures, they are pretty high on the food chain; with only tigers and human beings proposing any actual threat. Wolves have been dangerously close to extinction in certain number of states. They were driven to only a few hundred remaining in 48 States in the year 1973.
The near-extinction of these animals was of course, caused by humans. People moving into these states caused a great number of prey to turn into less, animals such as bison, deer, elk and even moose are important prey to the wolves and without them they starve. The wolves were forced to turn to man's livestock which upset man, then the wolves were being hunted for killing their sheep and cattle to survive. Animals like the fox, bear, raven, and eagle also died, as they depend on the wolves for food as well. These animals eat the carcasses of the left over food the wolves leave, these hunters and farmers had poisoned carcasses for the wolves; which also harmed the other animals.
Many subspecies of wolves have gone extinct such as the Dire wolf, this wolf went extinct a long time ago, this being around the same time that the gray wolf started its path along domestication. The Honshu and Hokkaido wolf were Japanese wolves that went extinct around the 18th century and 1912, due to the loss of prey and farmers poisoning them. Other wolves such as the English wolf have gone extinct as well but that's more based off location rather than a different sub-species.
Wolves are not a potential danger to humans, they show no threat unless maybe hungry or if they feel threatened themselves. There has been rare cases of a non-rabid wolf attacking humans but that is more of a freak accident. Wolves have adapted a feeling of fear towards humans given all they have experienced and they tend to stay away from us.
Humans have impacted wolves by taking away their territory, such as the trees, the loss of territory causes the wolves to breed with the coyotes. This can be seen as bad because these wolves are no longer pure if they are a coyote hybrid, which has the potential to make the pure gray wolf go extinct. Humans expanding their territories and hunting also kills wolves, and their prey; which, no animal benefits from this. Some sub-species of wolves have already gone extinct, right now the gray wolf is not at risk. The gray wolf has learned to settle in colder areas like the Antarctic, and Alaska. But if humans may eventually drive them extinct if we aren't careful. The colder areas of the world may not be safe enough, when will man learn to be content with what he has?