Tag Archives: farming Amazon

Deforestation Tolerance: Amazon

Guianan savanna. Image from wikipedia

Amazon generates approximately half of its own rainfall by recycling moisture 5 to 6 times as airmasses move from the Atlantic across the basin to the west.  From the start, the demonstration of the hydrological cycle of the Amazon raised the question of how much deforestation would be required to cause this hydrolological cycle to degrade to the point of being unable to support rain forest ecosystems.

High levels of evaporation and transpiration that forests produce throughout the year contribute to a wetter atmospheric boundary layer than would be the case with non-forest.This surface-atmosphere coupling is more important where large-scale factors for rainfall formation are weaker, such as in central and eastern Amazonia. Near the Andes, the impact of at least modest deforestation is less dramatic because the general ascending motion of airmasses in this area induces high levels of rainfall in addition to that expected from local evaporation and transpiration.

Where might the tipping point be for deforestation-generated degradation of the hydrological cycle? The very first model to examine this question  showed that at about 40% deforestation, central, southern and eastern Amazonia would experience diminished rainfall and a lengthier dry season, predicting a shift to savanna vegetation to the east.

Moisture from the Amazon is important to rainfall and human wellbeing because it contributes to winter rainfall for parts of the La Plata basin, especially southern Paraguay, southern Brazil, Uruguay and central-eastern Argentina; in other regions, the moisture passes over the area, but does not precipitate out. Although the amount contributing to rainfall in southeastern Brazil is smaller than in other areas, even small amounts can be a welcome addition to urban reservoirs…

In recent decades, new forcing factors have impinged on the hydrological cycle: climate change and widespread use of fire to eliminate felled trees and clear weedy vegetation. Many studies show that in the absence of other contributing factors, 4° Celsius of global warming would be the tipping point to degraded savannas in most of the central, southern, and eastern Amazon. Widespread use of fire leads to drying of surrounding forest and greater vulnerability to fire in the subsequent year.

We believe that negative synergies between deforestation, climate change, and widespread use of fire indicate a tipping point for the Amazon system to flip to non-forest ecosystems in eastern, southern and central Amazonia at 20-25% deforestation.

We believe that the sensible course is not only to strictly curb further deforestation, but also to build back a margin of safety against the Amazon tipping point, by reducing the deforested area to less than 20%, for the commonsense reason that there is no point in discovering the precise tipping point by tipping it. At the 2015 Paris Conference of the Parties, Brazil committed to 12 million ha of reforestation by 2030. Much or most of this reforestation should be in southern and eastern Amazonia.

Excerpts from Amazon Tipping Point  by Thomas E. Lovejoy and Carlos Nobre, Sciences Advances,  Feb. 21, 2018

Policing the Amazon Jungle

Transamazon Highway, image from wikipedia

The small town of Apui sits at the new frontline of Brazil’s fight against advancing deforestation…  The home of 21,000 people in southern Amazonas state was long protected by its remote location from illegal loggers, ranchers and farmers who clear the forest.  Now those who would destroy the jungle are moving in from bordering states, following the Transamazon Highway, which is little more than a red-dirt track in this part of the rainforest.

First come the loggers, who illegally extract valued lumber sold in far-off cities. The cattle ranchers follow, burning the forest to clear land and plant green pasture that rapidly grows in the tropical heat and rain. After the pasture is worn out, soy farmers arrive, planting grain on immense tracts of land…

Roughly 7,989 square kilometres (3,085 square miles) of forest were destroyed in 2016, a 29 percent increase from the previous year and up from a low of 4,571 square kilometers in 2012, according to the PRODES satellite monitoring system.

Then there are the fires.  Apui ranked first in the country for forest fires in the first week of August 2017, according to the ministry.

At their best the environmental agents can slow but not stop the destruction. They raid illegal logging camps, levy large fines that are rarely collected and confiscate chainsaws to temporarily impede the cutting.  Costa acknowledges that the roughly 1,300 environmental field agents who police a jungle area the size of western Europe have a difficult task, at the very least.

Excerpt from Brazil’s agents of the Amazon fighting loggers, fires to stop deforestation, Reuters, Aug. 20, 2017

Amazon Rainforest versus the Bureaucracy: who’s to win?

An international fund to protect the Amazon forest launched by Brazil in 2008 has gotten bogged down in red tape and donors are frustrated their $466 million contributions are hardly put to use, a Norwegian official said.  The fund was designed to slow deforestation by stimulating sustainable economic alternatives to cattle ranching and farming, which have destroyed parts of the forests.  So far Brazil has only used $39 million on 23 sustainable growth projects, with another $53 million under contract.

A government official from Norway, the fund’s largest donor, told Reuters in Brasilia that his country is unhappy with Brazil’s slow pace in identifying new projects, which has raised questions about the use of the funds in Brazil, where they are managed by the state-owned National Bank for Economic and Social Development (BNDES).  The source, who asked not to be named, said the funds contracted by the BNDES dropped by half between 2010 and 2011.  This has discouraged other potential donors from committing funds, the source said.

Conservationists say the BNDES has stymied projects with paperwork and endless meetings. Erika Nakazono, who runs a project for a social map of the communities living in the Amazon, said it took 19 months to get approval and somresearchers quit because of the delay. “The bureaucracy is very difficult. At one point I wondered whether all the effort was worth it,” Nakazono said.

The BNDES official heading the bank’s deforestation control department, Mauro Pires, admitted that the fund is not working as well as donors hoped.  “People wanted things done faster and to cover a wider range (of projects),” Pires told Reuters. He said the fund was a pioneering venture and procedures were still being worked out.  “We are working to create projects that go the heart of the deforestation problem,” he said.

By Jeferson Ribeiro, Brazil’s Amazon Fund bogs down, donors frustrated,Reuters, Jan.13, 2012