Wendell Berry and "radicalism"

In an interview in the US Progressive Magazine Wendell Berry, the acclaimed poet, novelist, author, farmer, ecologists and activist talks about why he is more radical the older he gets.

" The term “radical” has the same meaning in politics as it does in mathematics or in the word “radish.” It simply means “root.” So a radical would be a person who wants to address the root causes of a particular problem. In the proper sense of the term, I think I’ve probably become more radical."