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Rainforest in Transition: Is the Amazon Transforming before Our Eyes?

A review suggests that the Amazon rainforest may be changing, courtesy of human impacts on the region's weather

The Amazon rainforest is in flux, thanks to agricultural expansion and climate change. In other words, humans have "become important agents of disturbance in the Amazon Basin," as an international consortium of scientists wrote in a review of the state of the science on the world's largest rainforest published in Nature on January 19. (Scientific American is part of Nature Publishing Group.) The dry season is growing longer in areas where humans have been clearing the trees—as has water discharge from Amazon River tributaries in those regions. Multiyear and more frequent severe droughts, like those in 2005 and 2010, are killing trees that humans don't cut down as well as increasing the risks of more common fires (both man-made and otherwise).

The trees are also growing fast—faster than expected for a "mature" rainforest—according to a network of measurements.

The exact cause or causes of this accelerated growth—which means the Amazon's 5 million square kilometers of trees are now sucking in and sequestering some 400 million metric tons of carbon per year, or enough to offset the annual greenhouse gas emissions of Japan—"remains unknown," the researchers wrote in the review.

"When we measure that a particular stand of mature forest is accumulating carbon, it is difficult to say whether that might be due to recovery from some unrecognized disturbance long ago or whether it is due to more recent changes in climate and CO2," explained Woods Hole Research Center Senior Scientist and Executive Director Eric Davidson, lead author of the review, in an e-mail. Candidates include recovery from the potential wide-scale disturbance by pre-Columbian human societies now beginning to be uncovered or the increasing availability of some formerly limiting factor, such as atmospheric carbon dioxide.

In fact, increasing levels of CO2 in the atmosphere—now roughly 392 parts per million and rising—may be fertilizing the rainforest and preventing even greater impacts from reduced rainfall, although this question, Davidson and his colleagues wrote in the review, "may be one of the largest unknowns for the future of the Amazon forests."

What is known is that the forest clearing that has already gone on is decreasing forest rainfall. The Amazon produces roughly a third of its own precipitation—trees release moist air that then falls back as rain to nourish other trees (the rest comes from the Atlantic Ocean). But the air above cleared land warms faster and therefore rises more quickly, drawing the moist air from surrounding forested areas away. In fact, the conjunction of cleared and forested lands actually creates wind known as a vegetation breeze. But that breeze tends to blow rainfall away from the forest and over the surrounding pastures instead. It also weakens the continental-scale low-pressure system that draws rainfall over the Amazon.

The southern and eastern portions of the Amazon are the most affected, according to this review. For example, the southeastern Amazon around one of the local tributary rivers—the Tocantins—has seen pasture and cropland increase from 30 percent to 50 percent of the land between 1955 and 1995. As a result, that river now carries 25 percent more water. Another southeastern tributary, the Araguaia, now carries 28 percent more sediment—precious soil lost during downpours from surrounding, expanded agricultural fields.

Agroforestry and other techniques for better environmental management of such agriculture remain rare, despite their proven ability to help balance increased food production with ecosystem services like carbon sequestration. On the whole, cutting down trees so that the Amazon covers only roughly 80 percent of the land it once did seems to have tipped the rainforest from being a sink for global CO2 emissions to a net source, although this calculation remains highly uncertain, the scientists noted. In addition, the entire rainforest may be transitioning from a relatively undisturbed ecosystem to what scientists like to call a "disturbance-dominated regime," or a biome that has become an "anthrome"—a landscape dominated by human impact.

The good news is that Brazil has in recent years begun to restrain such deforestation: annual rates fell from 28,000 square kilometers in 2004 to less than 7,000 in 2011. "Brazil is poised to become one of the few countries to achieve the transition to major economic power without destroying most of its forests," the researchers wrote in their conclusion. New laws currently under consideration may put that potential in peril, however, by allowing a return of previously banned forest-clearing practices. "There is considerable progress toward improved management of the impacts of development in the region," Davidson noted in his e-mail, "but there is still much work to be done."A review suggests that the Amazon rainforest may be changing, courtesy of human... more

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"We are on the verge of genocide": an urgent call from the Peruvian Amazon

"The presence of Talisman here is causing divisions between those who have accepted the company and those who won't... We are on the verge of genocide."

In Achuar territory in the remote Peruvian Amazon, an already tense situation has taken a turn for the worse over recent months. According to the urgent testimony of two Catholic priests, who have been living in the region for more than 60 years combined, Canadian-based oil company Talisman Energy is fomenting severe divisions between indigenous communities, heightening the risk of imminent bloodshed between neighboring families.

Talisman is drilling exploratory oil wells in Oil Block 64 in a remote area of the Peruvian Amazon near the Ecuador border. The oil block overlaps the territory of the Achuar people, and wells are being drilled in the heart of Achuar ancestral territory, in the middle of critical hunting and fishing grounds in a flooded wetlands ecosystem that drains into Lake Rimachi, the largest lake in the Peruvian Amazon, and the Pastaza River Wetland Complex, a site acknowledged under the Ramsar Convention as one of the most productive aquatic ecosystems in the Amazon rainforest.

Achuar leader Peas Peas Ayui, President of the National Achuar Federation of Peru (FENAP) has just returned from Calgary, Canada where he met with Talisman CEO John Manzoni to demand that the company respect the Achuar people, withdraw from their territory and cease insistent attempts to convince communities to sign agreements. The Achuar previously delivered the same message to Mr. Manzoni in 2008 and 2010, but despite the Achuar people's steadfast opposition to oil drilling, Talisman Energy continues its relentless search for oil, resorting to dangerous industry practices: divided and conquer.

Recent testimony from Padre Diego and Padre Bola highlights signs of oil company bribery, ecological disruption, threats of bloodshed between indigenous communities, and even the first cases of sexually transmitted diseases are part and parcel of a deteriorating situation along the Pastaza and Morona rivers, where Talisman is currently exploring for oil.

The Peruvian government first created Block 64 in 1995 during the Fujimori dictatorship without consultation or consent from the Achuar people who live there. The oil block and Talisman's operations span two river basins: the Pastaza and the Morona. The block directly affects Achuar territory; Shuar-Wampisa and Shapra people downriver on the Morona are also affected.

The Achuar were united and opposed to oil operations since the creation of the oil block and forced successive companies to leave, but since Talisman's arrival in the region in 2004, two new Achuar organizations representing a minority group of eight out of the 50 Achuar communities have broken off and signed agreements with Talisman. The Achuar accuse Talisman of ignoring communities who oppose their operations and creating divisions and conflict through offering high financial incentives to any community or family who signs up with the company.

The testimony from Father Diego underlines the seriousness of this situation, and calls attention to the spread of this conflict downriver in Shuar-Wampisa communities where a peaceful protest in September 2011 almost ended in bloodshed after a group of pro-Talisman Achuar confronted protestors with guns. This was almost an exact repeat of a similar incident in May 2009 when 300-400 Achuar marched in protest to a Talisman well and were confronted by armed pro-Talisman Achuar standing with the company. Talisman is subject to ongoing litigation in Peru over its involvement in provoking this dangerous conflict.

More at the link
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Don't let Chevron get away with environmental crimes in Brazil!

"We're going to show [Chevron] that they can't come here and create
whatever environmental mess they want."

Those were the words of Carlos Minc, Rio de Janeiro state's environment secretary, in response to Chevron's oil spill off the Atlantic coast of Brazil. Judging from his statements to the press, Minc has grown increasingly frustrated with Chevron's actions following the spill.

Anyone familiar with the ongoing battle to bring Chevron to justice in Ecuador knows that the company will do everything it can to protect its profits even at the expense of the planet and human health. Brazilian officials are determined to make Chevron pay for the impacts of its reckless business operations. Send key environmental officials in Brazil a message now to let them know you've got their back.

It isn't just Chevron's response to the spill that has been criticized. Before and after the spill occurred, Chevron showed shockingly little concern about the risks involved. The company reportedly drilled deeper than it was licensed to, and had to borrow sonar equipment to even locate where the leak was occurring. Chevron was completely unprepared for an oil spill – or perhaps I should say, completely unconcerned. Production and profits are all that really matter to Chevron.

No wonder Carlos Minc has also been quoted saying: "We believe the accident could've been avoided. There was an environmental crime. [Chevron] hid information and their emergency team took almost 10 days to start acting."

Brazil's National Petroleum Agency says more than 110,000 gallons of oil have spilled into the Atlantic Ocean. Write to Carlos Minc and other key Brazilian environmental officials now and urge them to hold Chevron accountable for every last drop.

For a cleaner future,
Mitch Anderson
Corporate Campaigns Director

P.S. AlterNet recently named Chevron the #1 "Most Toxic Energy Company," a label the company richly deserves. Even while it refuses to pay to clean up its messes in Ecuador and around the world, Chevron is spending huge sums of money to influence public policy in a preemptive bid to never be held accountable for the damage it does to the planet. Share this story to help expose Chevron and other energy companies that are polluting our political process.

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