In 2017, Cape Town, South Africa, was on a countdown to disaster. An unprecedented and wholly unforeseen third consecutive year of drought threatened to cut off water to the city’s four million citizens. Faced with the prospect of running dangerously low on potable water, local officials raced against time to avert “Day Zero”—the date on which they would have to shut off drinking water to most businesses and homes in the city. Cape Town’s government responded effectively to the fast-worsening and potentially cataclysmic situation. Key to the effort was a broad, multipronged information campaign that overcame skepticism and enlisted the support of a socially and economically diverse citizenry as well as private companies. Combined with other measures such as improving data management and upgrading technology, the strategy averted disaster. By the time the drought eased in 2018, Capetonians had cut their water usage by nearly 60% from 2015 levels. With each resident using little more than 50 liters per day, Cape Town achieved one of the lowest per capita water consumption rates of any major city in the world. The success set a benchmark for cities around the world that confront the uncertainties of a shifting global climate.

Leon Schreiber drafted this case study based on interviews conducted in Cape Town, South Africa, in November 2018. Case published February 2019.

In 1994, Costa Rica's new minister of the environment, René Castro, faced a difficult task. The finance ministry was planning to cut the funding of a subsidy program that had started to reverse decades of forest loss, and Castro urgently needed a new policy that would sustain the program's progress. First, Castro built a broad-based coalition to press for a revamped national forestry law. The coalition persuaded the legislature to ban the conversion of forested land to other uses and to create incentives for landholder compliance. In 1997, Costa Rica implemented the world's first countrywide payments for environmental services program, which recognized the continuing economic contribution of forests in terms of greenhouse gas mitigation, biodiversity conservation, water protection, and scenic beauty. Funded by a new fossil fuel tax, carbon credit sales, and money from companies that benefited from the forests, the program offered landowners financial incentives to preserve and expand tree cover on their properties. The program helped reduce the destruction of primary forest and encouraged reforestation of degraded land. From 1997 to 2005 Costa Rica's forest cover increased to 51% of total land area from 42%.

Blair Cameron drafted this case study based on interviews conducted in Costa Rica in December 2014. The case was funded by the Norwegian Agency for Development Cooperation in collaboration with the Science, Technology, and Environmental Policy program of the Woodrow Wilson School of Public and International Affairs. Case published July 2015.

A former center of the timber industry in the Brazilian Amazon, the municipality of Dom Eliseu had built its economy around deforestation—much of it illegal. In 2008, as part of a strategy to enforce the country’s environmental policies, the federal Ministry of the Environment included Dom Eliseu on a list of the worst violators of deforestation laws. The blacklist cut off residents’ access to markets and credit and made the municipality the target of intensive law enforcement. To get off the blacklist, the community had to overcome a collective-action problem. The local government had to persuade the owners of 80% of private land—more than 1,000 properties—to map their property boundaries, declare the extent of deforestation, enter their properties in the state environmental registration system, and adopt more-sustainable methods of production. The municipality also had to build the capacity to take on new responsibilities for environmental protection—most important, environmental licensing, which would enable the local government to regulate land use. With support from nongovernmental organizations and the state, Dom Eliseu successfully coordinated private compliance with the national policy and left the blacklist in 2012.

Maya Gainer drafted this case study based on interviews conducted in Belém and Dom Eliseu, Brazil, in September 2014. This case was funded by the Norwegian Agency for Development Cooperation in collaboration with the Science, Technology, and Environmental Policy program at the Woodrow Wilson School of Public and International Affairs. Case published March 2015.