The Argentine branch of international environmental organization Greenpeace marked World Environment Day—a UN-sponsored event held each June 5—with a protest highlighting damage that the pro-mining policies of José Luis Gioja, governor of the northwestern province of San Juan, could have on Argentina's San Guillermo Biosphere Reserve. Eight Greenpeace activists climbed the Civic Center building in the city of San Juan and unfurled a 20-meter banner with a photograph of a puma and a caption reading: "Gioja: no mining in San Guillermo." The activists were arrested and taken to the central police station.

Members of 27 campesino communities in the San Francisco district of Panama's western Veraguas province held a protest on June 7 to demand the cancellation of permits given for the construction of the Lalin 1, Lalin 2 and Lalin 3 hydroelectric projects on the Gatú river. The protesters charged that there were irregularities in the environmental impact studies for the dams. They also said that they hadn't been consulted on the projects and that the companies involved were ignoring an order from San Francisco's mayor to suspend construction. The communities proposed the promotion of cooperatives, ecological tourism and farming based on ecological principles as alternatives to what they consider the government's bad development policies. The demonstration ended without incident, although the protesters complained about the presence of investigative and anti-riot police. Veraguas' governor agreed to start negotiations with the campesinos. (Radio Temblor, Panama, June 7)

Osiel Gabriel, an indigenous Terena, was killed on May 30 when Brazilian federal police violently removed a group of Terena protesters who had been occupying the Buriti estate in Sidrolandia, in the southern state of Mato Grosso do Sul, since May 15. At least three indigenous people and one police agent were treated at a local hospital with light injuries; eight protesters were arrested. The occupiers reportedly fought back with wooden clubs and bows and arrows and set some of the estate's buildings on fire. The authorities claimed police agents only used rubber bullet and tear gas; according to state police superintendent Edgar Paulo Marcon, the protesters fired on the agents.

On May 24 Chile's environmental regulator, Juan Carlos Monckeberg, ordered a suspension of construction at the Toronto-based Barrick Gold Corporation's giant Pascua Lama mine because of violations of environmental laws. He also fined the company $16 million, the largest penalty Chile has ever imposed for an environmental violation. Monckeberg told the Reuters wire service on May 30 that the company would probably require one to two years to make the repairs that would allow it to resume construction.

The Collective for the Compensation of Cholera Victims (Comodevic) and Moun Viktim Kolera ("People Who Are Cholera Victims," Movik) sponsored a march in Port-au-Prince on May 31 to mark nine years since the arrival of the United Nations Stabilization Mission in Haiti (MINUSTAH). Marching from the Fort National neighborhood to the Justice Ministry and the Ministry of Public Health and Population (MSPP), the protesters demanded that the international military and police force leave Haiti and called on the government to join legal actions seeking compensation from the United Nations (UN) for people affected by cholera. At least 8,096 people have died in a cholera epidemic that was set off in October 2010 by poor sanitation at a MINUSTAH base in the Central Plateau where Nepalese soldiers carrying the disease were stationed.

According to organizers, hundreds of thousands of environmentalists and other activists participated in marches in 436 cities and 52 countries on May 25 to protest the Missouri-based biotech giant Monsanto Company, whose products include genetically modified (GM) seeds and the glyphosate-based herbicide Roundup. The global March Against Monsanto generated events in countries including Australia, France, Germany, the Netherlands, Spain, the UK and the US. (La Jornada, Mexico, May 26, some from AFP, Prensa Latina)

Thousands of Guatemalans marched in Guatemala City on May 24 to protest a decision four days earlier by the Constitutional Court (CC) overturning the historic May 10 conviction of former dictator Efraín Ríos Montt (1982-83) for genocide against the Ixil Mayans in El Quiché department. Organizers said 6,000 people participated in the march, which passed by the offices of the Coordinating Committee of Agricultural, Commercial, Industrial and Financial Associations (CACIF)—whose leaders had called for the reversal of the ex-dictator's conviction—and ended with a sit-in outside the Constitutional Court. Protesters denounced the judges as "promoters of impunity."

According to protesters, about 100 regular police and riot squad agents used tear gas and live ammunition on May 23 to break up a demonstration by members of the indigenous Lenca community of San Antonio Chuchuitepeque in the northwestern Honduran department of Santa Bárbara. A number of protesters were injured and five were arrested, according to Berta Isabel Cáceres Flores, the coordinator of the Civic Council of Grassroots and Indigenous Organizations of Honduras (COPINH), who was present at the demonstration.