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SAO PAULO - Good news does not often emerge from the Amazon rainforest, a part of the world that has become synonymous with man's rapacious desire to turn verdant wilderness into the greenery of dollar bills.
But that is set to change when a Brazilian politician announces the
birth of the world's largest tract of tropical rainforest that is protected by law and policed by satellite.
Simao Jatene, the governor of the northern Brazilian state of Para, will today designate an area substantially bigger than England as a unique conservation region - the biggest of its kind in the world.
Environmental groups believe the new reserve will be the basis of a renaissance in tropical rainforest conservation, a move that they hope will save the rest of Amazonia from destruction.
Sceptics may argue that we have heard it all before. Past measures to conserve the Amazon have done little to prevent its relentless disappearance - an area bigger than France has gone in a single generation.
But environmentalists who have worked closely with Jatene and the state government believe that this time the deal is different.
"If any tropical rainforest on Earth remains intact a century from now, it will be this portion of northern Amazonia," said Russell Mittermeier, the president of Conservation International, an environmental group based in Washington which has worked closely on the deal.
"The region has more undisturbed rainforest than anywhere else, and the new protected areas being created by Para state represent a historic step toward ensuring that they continue to conserve the region's rich biodiversity, due in large part to the governor's visionary achievement."
The area covered by the new state law will be 16.4 million hectares. The land adjoins rainforests that are already protected to some degree both within Brazil and in the neighbouring countries of Guyana, Suriname and French Guiana. In total, the protection zones form an immense green corridor known as the Guyana Shield, which straddles national borders and includes some of the richest wildlife habitats on earth.
The Guyana Shield contains more than 25 per cent of the Earth's humid tropical rainforest, and almost 90 per cent of it is still in its pristine, natural state. The area also includes important populations of at least eight endangered species, such as the little spotted cat, leopardus tigrinus, the bush dog, speothos venaticus and the great-billed seed finch, oryzoborus maximiliani.
Other endangered animals whose habitats are covered by the deal include the giant otter and the northern bearded saki monkey, as well as other well-known flagship species of the Amazon basin such as the jaguar, giant anteater and black spider monkey.
"This is the greatest effort in history toward the creation of protected areas in tropical forests," said Adalberto Verissimo, a senior researcher at the Amazon Institute of People and the Environment.
Under the terms of the agreement, about one third of the 16.4 million hectares covered by the new arrangement will be totally protected against any agricultural, industrial or domestic development.
In this region, only indigenous people will be allowed to pursue their traditional ways of life, and they will not be able to own land and therefore will not be able to sell it on to developers.
Human activity in the rest of the region, covering the remaining two-thirds of the conservation area, will be strictly controlled.
"Traditional communities will be living in these areas, which will be protected. They will be allowed to use the forest in a sustainable way but this will not involve the clear-cutting of the forest," Jatene said.
Road-building, logging, agriculture, mining and any other destructive, non-sustainable activities would be either banned or strictly controlled, he said.
"If anyone tries to do this illegally, it will be detected by satellites."
According to the Brazilian Government's National Institute of Space Research, the loss of the Amazon rainforest has been relentless over the past 35 years.
During this time, an area of more than 60 million hectares has been logged.
The accumulated areas of Amazonia that have been deforested rose from 41.5 million hectares in 1990 to 58.7 million hectares in 2000.
In just 10 years, the country lost an area of forest that was twice the size of Portugal. The rate of deforestation rose to a new peak in 2002, most of forested land cleared to make way for soya-bean crops, used as cattle feed.
Many scientists predict that, at the current rate at which the Amazon rainforest is being destroyed, little if any of it would remain by the end of this century. This would make it harder to curb global warming.
The Amazon - called the "lungs of the world" - plays an important role in absorbing carbon dioxide and releasing oxygen.
Some studies have suggested a far earlier demise of the Earth's largest tropical rainforest, which accounts for about 40 per cent of all the world's rainforests.
Past attempts to protect the Amazon have come as directives from the federal Government based in the capital, Brasilia. These directives have not always been in touch with local opinion and sentiment towards the forests they were designed to protect.
"In the past, the creation of protected areas was not done by any overall plan. The unique aspect of this agreement is that it is done with the full co-operation of the local people," Jatene said. "This is a political agreement and without it, it would not be possible to create such a huge area that will be covered by the protection."
The biggest pressures on the Amazon rainforest come from the south, with the growth of cattle ranching and soya farming.
In the more southerly Brazilian state of Mato Grosso, soya is one of the principal means of generating wealth. Half of Brazil's total loss of rainforest was in this one state, which is controlled by soya-bean interests.
However, Verissimo said that local people living further north believe that the short-term gains from cutting down the rainforest are not worth the potential long-term benefits of keeping a sustainable resource for future generations.
"They look at the areas of the Amazon that have already been deforested and they see there are no jobs, and no development. So they look at what is left and they ask, 'What can be done instead'?" Verissimo said.
Jose Silva, the vice-president of science at Conservation International, said that the deal marked the most important development in environmental conservation for a decade.
"There are a lot of strategically important minerals in the area but no one will be able to mine them in the strictly protected areas.
"This is a turning point and it began about four years ago with a new generation of state politicians who have come in to change the situation."
The most difficult task was making sure that the protection is properly enforced.
"Yes, the biggest challenge is to guarantee that we have enough resources to implement this agreement and to protect what is in effect the last frontier of the world's tropical rainforests."
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