Cooperation among states based on custom and practice without formal agreement is commonly referred to as which are particularly prominent in terms of reaching agreements about the care of the environment.

International regime

Explanation: The concept was first introduced to international relations by John Ruggie in 1975 but the most widely known definition was given by krasner.

He defined it as a ‘set of implicit or explicit principles, norms, rules, and decision-making procedures around which actors' expectations converge’ in 1983. It was further explained that although regimes include formal treaties and national law, they also rely on informal norms and networks to develop and enforce standard behavior in an area of global policy.

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