It appears sustainable policies are often associated with progressive or left-wing politics. For example, the Wikipedia article on green politics states:

Green politics is a political ideology that aims to create an ecologically sustainable society rooted in environmentalism, social liberalism, and grassroots democracy.

Opposition to pipelines such as Nord Stream in Europe and Keystone in North America also appears to be linked with progessive policies.

Is this so?

Why are policies aimed at sustainability divisive at all?