The Piraha, a tribe in the Amazon in Brazil, whose language eschews number words in favor of terms like few and many, are not able to keep track of exact quantities.
Mercury poisoning can be found almost anywhere, including places considered remote, like the Amazon River basin in Brazil.
Close on the heels of the launch of its e-book store in Brazil, Amazon announced the launch of its Kindle e-book store in China last Thursday.
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Building a hotel in the treetops is hardly a new idea: Brazil's Ariau Amazon Towers Hotel has been inviting guests to explore the jungle canopy from its rooms since the mid-1980s.
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Other than Rio de Janeiro, the Amazon is where everyone wants to go in Brazil.
Outside Brazil, the fight for the Amazon is seen largely as an ecological matter, but here it's a social issue.
In Brazil, meanwhile, huge swathes of Amazon rainforest are being lost to sugarcane plantations, again for the provision of raw materials to the biofuel industry.
In Brazil, for instance, multinational environmental NGOs like Amazon Watch, Greenpeace and the WWF have been seen at the forefront of movements to stall agribusiness and hydroelectric power projects.
"It could be that many of the susceptible trees were killed off in 2005, which would reduce the number killed last year, " said Paulo Brando from the Amazon Institute of Environmental Research (IPAM) in Belem, Brazil.
Not since a military government quartered the Amazon basin with roads, dams and settlements in the 1970s has Brazil seen such a row over the rainforest.
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Having chopped down almost all of the Mata Atlantica, the forest along Brazil's east coast, they have moved into the Amazon, where they have recently been joined by Malaysian plywood firms.
They're used for reforestation projects in central Brazil where loggers, ranchers and farmers have cleared huge swaths of Amazon rainforest and semi-arid savannah.
Over the past decade, Brazil has cracked down on clear-cutting, especially in the biodiverse Amazon rain forest, reducing the rate of deforestation by 80%.
Language, geography and history have combined to isolate Brazil from its Spanish-speaking neighbours on the far side of the Amazon rainforest and the Parana basin, let alone from the wider world.
Brazil's government pledged to cut the amount of illegal deforestation in the Amazon over the next decade to 5, 000 sq km (1, 930 square miles) a year, or less than half the current rate.
In Brazil in recent years, the government reportedly has stepped up efforts to slow the Amazon's destruction.
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The World Wildlife Fund's Maretti is hopeful that Brazil, with international help, will be able to protect even more of the Amazon, an area he considers among the most vital natural habitats in the world.
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Brazil and Peru have nearly completed a highway to carry goods from Brazilian farms through the Amazon and over the Andes to Peru's Pacific ports.
The new claim in Brazil follows an expedition by scientists which is said to have discovered a new source for the Amazon in the south of Peru and not the north of the country as had been thought for many years.
Amazon is ALSO selling the books in the UK and Canada, France, Germany, Spain, Italy, Brazil, Japan and India.
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Requena is a very small city in the Upper Amazon region of Peru (population 25, 000), near a tri-border area with Colombia and Brazil.
Brazil recently turned down a request from Colombia's armed forces to use an airstrip in the Amazon, saying that it did not want to take sides in an internal matter.
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Brazil currently has two other mid-sized hydroelectric dams being built in urban areas outside of the Western Amazon.
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In 2007 the Brazil government gave an initial go-ahead for the construction of two hydro-electric dams on the Amazon's longest tributary.
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