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Aerial view of deforestation in eastern Madagascar. (Photo by R. Butler)
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Chapter 9:
CONSEQUENCES OF DEFORESTATION
Rainforests around the world still continue to fall. Does it really make a difference? Why should anyone care if some plants, animals, mushrooms, and microorganisms perish? Rainforests are often hot and humid, difficult to reach, insect-ridden, and have elusive wildlife.
Actually the concern should not be about losing a few plants and animals; mankind stands to lose much more. By destroying the tropical forests, we risk our own quality of life, gamble with the stability of climate and local weather, threaten the existence of other species, and undermine the valuable services provided by biological diversity.
While in most areas environmental degradation has yet to reach a crisis level where entire systems are collapsing, it is important to examine some of the effects of existing environmental impoverishment and to forecast some of the potential repercussions of forest loss. Continuing loss of natural systems could make human activities increasingly vulnerable to ecological surprises in the future.
The most immediate impact of deforestation occurs at the local level with the loss of ecological services provided by tropical rainforests and related ecosystems. Such habitats afford humans valuable services such as erosion prevention, flood control, water treatment, fisheries protection, and pollination—functions that are particularly important to the world's poorest people, who rely on natural resources for their everyday survival. Forest loss also reduces the availability of renewable resources like timber, medicinal plants, nuts and fruit, and game.
Over the longer term, deforestation of tropical rainforests can have a broader impact, affecting global climate and biodiversity. These changes are more difficult to observe and forecast from local effects, since they take place over a longer time scale and can be difficult to measure.
Extreme Deforestation - Easter
Island
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Continued: Local Impact of Deforestation
This article was written by Rhett A. Butler [bibliographic citation for this page] and was last updated on the most recent date listed in the column on the right side.
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Recent news
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(06/30/2009) New NASA research shows a sharp decline in the amount of smoke over the Amazon during the 2008 burning season, coinciding with a drop in deforestation reported last week by Carlos Minc, Brazil's Environment Minister. Analyzing the aerosol concentrations over the Amazon each September from the past four burning seasons using the Ozone Monitoring Instrument on NASA's Aura satellite, atmospheric scientist Omar Torres of Hampton University and several colleagues found a dramatic decline in airborne particular matter in 2008, indicating reduced incidence of fire in the region. Fire in the Amazon is primarily used by humans for land-clearing to establish cattle pasture, which now accounts for the vast majority of land-use change in the world's largest rainforest.
U.S. forgives $30M in debt to protect rainforests in Sumatra, Indonesia
(06/30/2009) The United States will forgive nearly $30 million in debt owed by Indonesia in exchange for increased protection of endangered rainforests on the island of Sumatra, reports the Wall Street Journal. The deal is the largest debt-for-nature swap under the U.S. Tropical Forest Conservation Act — unanimously reauthorized this May by the Senate Foreign Relations Committee last week — and its first such agreement with Indonesia, which has the second highest annual loss of forest cover after Brazil. Under the terms of the pact the government of Indonesia will put $30 million into a trust over the next eight years. The trust will issue annual grants for forest conservation and restoration work in Sumatra, an island that lost nearly half of its forest cover between 1985 and 2007 as a result of logging, conversion for plantations, and forest fires.
A New Idea to Save Tropical Forests Takes Flight
(06/29/2009) Every year, tens of millions of acres of tropical forests are destroyed. This is the most destabilizing human land-use phenomenon on Earth. Tropical forests store more aboveground carbon than any other biome. They harbor more species than all other ecosystems combined. Tropical forests modulate global water, air, and nutrient cycles. They influence planetary energy flows and global weather patterns. Tropical forests provide livelihoods for many of the world’s poorest and marginalized people. Drugs for cancer, malaria, glaucoma, and leukemia are derived from rainforest compounds. Despite all these immense values, tropical forests are vanishing faster than any other natural system. No other threat to human welfare has been so clearly documented and simultaneously left unchecked. Since the 1992 Rio Earth Summit (when more than 100 heads of State gathered to pledge a green future) 500 million acres of tropical forests have been cut or burned. For decades, tropical deforestation has been the No. 1 cause of species extinctions and the No. 2 cause of human greenhouse gas emissions, after the burning of fossil fuels. For decades, a few conservation heroes tried their best to plug holes in the dikes, but by and large the most diverse forests on Earth were in serious decline.
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