The transnational nature of such resources points to another problem with a traditional definition of global public goods. Remedies to problems such as air and water pollution are typically legal remedies, and such laws often exist only in the context of geographically-bounded governmental systems. In the case of global public goods—such as climate change mitigation, financial stability, security, knowledge production, and global public health—either international or supranational legal entities (both public and private) must be created to manage these goods. As different types of global public goods often require different types of legal structures to manage them, this can contribute to a proliferation of non-governmental organizations (NGOs) and intergovernmental organizations (IGOs), such as has been the case in the recent past.