In Europe--and I am taking Europe not just in the limited geographical sense, but in a more political way—environmental regulations have been created and further evolved by different means and instruments: bilateral agreements, limited regional agreements, and multilateral agreements adopted by nearly all European States.
"Environmental Law-Making In The European Context And Its Relations To International Environmental Agreements,"
ILSA Journal of International & Comparative Law: Vol. 2
, Article 18.
Available at: http://nsuworks.nova.edu/ilsajournal/vol2/iss3/18