Politics of early 21st century

Realism is a major characteristic of international politics in 20th century. A world change as time goes by and so does politics. I believe that we now live in a very transforming era from dominating realist ideology to much wider global responsibility. Global warming, population growth, food and water shortages, WMD threat, global terrorism etc. Those are only few things among many other problems that threat the very existence of all beings on earth.  International policy makers have strong duty and obligation to make much smarter judgment rather than the one that only aimed at pursuing narrow self-interested one.