Photo: Deforestation in Mato Grosso, a major soybean growing region in Brazil leoffreita (flickr)

The woman known as the “guardian angel” of the world’s biggest rainforest has called it quits.

Marina Silva cited "the growing resistance found by our team in important sectors of the government and society" in stepping down as Brazil’s environment minister. Environmentalists saw her as a key ally in defending the Amazon.

Silva’s resignation is but one in a series of foreboding events in the face of increasing deforestation. Despite three years of decline, deforestation accelerated in the Brazilian Amazon during the last half of 2007. Land conversion pressures are attributed to soaring prices and demand for soy and beef exports. Brazil’s ascent to an agricultural superpower and its steady, 5-percent economic growth has stimulated hydroelectric dams, roads and other infrastructure projects.

The environmental effects of Amazonian destruction have global consequences. Deforestation not only threatens the existence of the indigenous populations who have lived in the Amazon for millennia, but also irreversibly damages a region of unparalleled biodiversity. Deforestation also exacerbates global warming. According to mongabay, an environmental news site:

… the country is ranked as the world's fourth-largest emitter of greenhouse gases due largely to deforestation and forest degradation, which account for 70 percent of its total greenhouse gas emissions.

Despite the global importance of the Amazon, Brazil’s president Luiz Inacio Lula da Silva has made it clear that an international debate on the Amazon's fate is unwelcome.

This week, President Lula declared: "The Brazilian Amazon has an owner, and that owner is the Brazilian people.” He acknowledged conservationists' concerns but stressed the need to use the resources of the Amazon forest, which makes up two-thirds of the country’s territory.

If Brazil insists on framing the Amazon as a domestic issue, perhaps the best hope for conservation lies with the people who inhabit it. Construction of the Belo Monte dam — which would be one of the world's largest hydroelectric power plants, after China's Three Gorges and the Itaipu dam shared by Brazil and Paraguay and would also threatens severe ecological and social damage — gathered more than 1,000 environmental activists and Indians protesters in Altamira last week.

Nineteen years ago, a similar dam project was successfully defeated after being met with international condemnation. With today’s rate of deforestation and economic pressures, however, the future of the Amazon looks grim. The actions of both President Lula and Marina Silva lead us to one conclusion: in Brazil, economic growth trumps environmental protection.