but, as already illustrated, even in relation to the politics of responding to international environmental problems, non-state actors typically also play a primary role. superanational organizations such as the EU play a key international role alongside states, as well as being able to regulate activities within their member states. the EU is itself a party to several international environmental treaties. international organizations, social movements, womens groups, consumer groups, and scientisis can all play a key role. even in relation to international environmental negotiations and agreements, there are numerous examples of ono-state actors playing central roles. moreover, as states become enmeshed in international institutions or regimes established to tackle environmental problems, the policy process often acquiren an important transnational or international dimension which in practice can substantially limit national autonomy