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The issue of species' decline has so many causes, but save to say the drive for increasing scale economics and producing as much as possible with as little obstacles as possible is one of the major causes. Other being that we use land rather inefficiently. If you're a meat eater it is much better for instance to go with chicken instead of beef and pork, since larger animals require more food, space, and water and that means the land isn't used for some other purpose or left to the wildlife..
Often we hear about overpopulation, and whilst this plays a role it is also true that poorer countries have less environmental impact despite having larger populations. How and what we consume plays a much bigger role..
It really saddens me how we can turn such a beautiful world into one with only more roads, buildings, and especially monoculture landscapes near devoid of life. What we are effectively doing is creating a global desert as far as biodiversity is concerned. It's painful to look at what we're doing, and it's a shame that human development and progress often doesn't go hand in hand with improvement of the environment. How and why these bears go south is likely connected to all these other issues.
We do not have the power to change everything we do but we can all ask ourselves what we can do, not what we can't..
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