In the early 1970s, a significant shift occurred in the relationship between North Americans and the world we live in. People started to recognize that nature's bounty isn't bottomless and that human activities often strain the Earth's limits. Across Canada and the U.S., faced with society's perpetual penchant for economic growth as an end unto itself, many people started to advocate for protecting nature lest it be irreparably broken by our actions.
http://www.davidsuzuki.org/blogs/science-matters/2013/05/ontarios-wildlife-needs-continued-protection/?mkt_tok=3RkMMJWWfF9wsRonv6rKZKXonjHpfsX94%2BooXLHr08Yy0EZ5VunJEUWy2YAITNQ/cOedCQkZHblFnV0AQq2jWLUNqaMN