Abstract
In their Institutions for the Earth (1993), Haas, Keohane and Levy argue that, at the international level, three fundamental conditions must be met for the effective management of environmental problems. They summarise these conditions as the three 'Cs'-the building of concern; the existence of a suitable contractual environment; and the growth of state capacity. We applied the Haas, Keohane and Levy (HKL) model to three case studies at the national level, in order to ascertain the extent to which the three Cs explained the emergence of successful institutional regimes. We found that two of the three variablesimprovements to the contractual environment and increases in state capacity-had considerable explanatory power. Concern was important in providing the motive force for change, but high levels of concern did not lead to effective institutional regimes unless the other two factors were present. We found a strong reciprocal relationship between state capacity and the contractual environment-the ability to monitor solutions and to generate policy-relevant 'trustable' information, was positively associated with improved negotiating structures and outcomes.

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