Most Greens reject radical centrist politics though there is a strong overlap between that perspective and what is occasionally referred to as the "realist" wing of the Greens.
Greens often refer to productivism, consumerism and scientism as examples of "grey" views, which implies age, ashphalt and obsolete ideas of human social organization, including globalization of economic relations.
Green politics is usually said to include the green anarchism, eco-anarchism, anti-nuclear and peace movements - although these often claim not to be aligned with any party.
The interview followed Schroeder's huddle with Foreign Minister Joschka Fischer, the strongest voice of the ecologistGreens, junior partners in the ruling coalition, to quiet the controversy.
The Greens, the key force behind Germany's atomic energy pull-out, have demanded formal coalition talks on the deal, which Schroeder announced during a trip to China this month.
Greens deputies said, however, that they would not go quietly and were angered by what they saw as the foreign minister's passivity.