Satellite data for the 12 months through the end of July 2013 showed that 5,891 square km (3,360 square miles) of forest were cleared in the Brazilian Amazon, an area half the size of Puerto Rico.
Fighting the destruction of the Amazon is considered crucial for reducing global warming because deforestation worldwide accounts for 15 percent of annual emissions of heat-trapping gases, more than the entire transportation sector. Besides being a giant carbon sink, the Amazon is a biodiversity sanctuary, holding billions of species yet to be studied.
Preliminary data released late last year by Brazil's space research center INPE had indicated deforestation was on the rise again, as conservationist groups had warned.
The largest increases in deforestation were seen in the states of Para and Mato Grosso, where the bulk of Brazil's agricultural expansion is taking place. More than 1,000 square km (390 square miles) has been cleared in each state.
Other reasons for the rebound in deforestation include illegal logging and the invasion of public lands adjacent to big infrastructure projects in the Amazon, such as roads and hydroelectric dams.
Despite the increase in 2013, the cleared area is still the second-lowest annual figure since the Brazilian government began tracking deforestation in 2004, when almost 30,000 square km (11,580 square miles) of forest were lost.
Brazil Confirms Amazon Deforestation Sped Up in 2013
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