Alert system shows potential for reducing deforestation, mitigating climate change

January 04, 2021

CORVALLIS, Ore. - Forest loss declined 18% in African nations where a new satellite-based program provides free alerts when it detects deforestation activities.

A research collaboration that included Jennifer Alix-Garcia of Oregon State University found that the Global Land Analysis and Discovery System, known as GLAD, resulted in carbon sequestration benefits worth hundreds of millions of dollars in GLAD's first two years.

Findings were published today in Nature Climate Change.

The premise of GLAD is simple: Subscribe to the system, launch a free web application, receive email alerts when the GLAD algorithm detects deforestation going on and then take action to save forests.

GLAD, launched in 2016, delivers alerts created by the University of Maryland's Global Land Analysis and Discovery lab based on high-resolution satellite imaging from NASA's Landsat Science program. The information is made available to subscribers via the interactive web application, Global Forest Watch.

"Before GLAD, government agencies and other groups in the business of deforestation prevention had to lean on reports from volunteers or forest rangers," Alix-Garcia said. "Obviously the people making those reports can't be everywhere, which is a massive limitation for finding out about deforestation activity in time to prevent it."

Changes in land use make a huge difference in how much carbon dioxide reaches the atmosphere and warms the planet, said Alix-Garcia, an economist in OSU's College of Agricultural Sciences.

"Reforestation is good, but avoiding deforestation is way better - almost 10 times better in some instances," she said. "That's part of why cost-effective reduction of deforestation ought to be part of the foundation of global climate change mitigation strategies."

Deforestation, Alix-Garcia adds, is a key factor behind the 40% increase in atmospheric carbon dioxide since the dawn of the industrial age, which in turn is contributing heavily to a warming planet. According to the National Oceanic and Atmospheric Administration, the global average atmospheric carbon dioxide concentration in 2018 was 407.4 parts per million, higher than at any time in at least 800,000 years.

The annual rate of increase in atmospheric CO2 over the past six decades is roughly 100 times faster than increases resulting from natural causes, such as those that happened following the last ice age more than 10,000 years ago, according to NOAA.

Alix-Garcia, study leader Fanny Moffette of the University of Wisconsin and collaborators at the University of Maryland and the World Resources Institute looked at deforestation in 22 nations in the tropics in South America, Africa and Asia between 2011 and 2018 - the last five years before GLAD and first two years after.

In Africa, the results were telling: Compared to the prior five years, the first two years of GLAD showed 18% less forest loss where forest protectors were subscribing to the system.

Using a concept known as the social cost of carbon - the marginal cost to society of each additional metric ton of greenhouse gas that reaches the atmosphere - researchers estimate the alert system was worth between $149 million and $696 million in Africa those two years.

There was no substantial change in deforestation in Asia or South America, however, but possible explanations for that are numerous and suggest GLAD can make a greater difference in those places in years to come, the researchers say.

"We think that we see an effect mainly in Africa due to two main reasons," Moffette said. "One is because GLAD added more to efforts in Africa than on other continents, in the sense that there was already some evidence of countries using monitoring systems in countries like Indonesia and Peru. And Colombia and Venezuela, which are a large part of our sample, had significant political unrest during this period."

The GLAD program is still young and as more groups sign up to receive alerts and decide how to intervene in deforestation, the system's influence may grow, she added.

"Now that we know subscribers of alerts can have an effect on deforestation, there are ways in which our work can potentially improve the training the subscribers receive and support their efforts," Moffette said.
-end-


Oregon State University

Related Deforestation Articles from Brightsurf:

Degradation outpaces deforestation in Brazilian Amazon
The area of the Brazilian Amazon affected by forest degradation--where forest biomass is lost but not completely converted to another use--is greater than the area affected by deforestation, according to a long-term study by Eraldo Aparecido Trondoli Matricardi and colleagues.

Growing demand for zero-deforestation cacao might not help Colombian forests
Cacao in Colombia is not a major driver of deforestation - yet.

Small-farm tech reduces deforestation, climate change
Small farms in Zambia that use the latest hybrid seed for maize, help reduce deforestation and tackle climate change in a new Cornell University study.

The complex relationship between deforestation and diet diversity in the Amazon
As increasing areas of the Amazonian rainforest are converted into agricultural land, scientists are examining how this is linked with local communities' food access.

Why are we still failing to stop deforestation?
While national and international efforts to reverse the trend of deforestation have multiplied in recent years, there is still no clear evidence to suggest that these initiatives are actually working.

Stopping deforestation: lessons from Colombia
A study of deforestation in Colombia by researchers from The University of Queensland has revealed some valuable insights which could be used to help slow deforestation in areas around the globe.

Climate may play a bigger role than deforestation in rainforest biodiversity
In a study on small mammal biodiversity in the Atlantic Forest, researchers found that climate may affect biodiversity in rainforests even more than deforestation does.

Study finds deforestation is changing animal communication
Deforestation is changing the way monkeys communicate in their natural habitat, according to a new study.

Geographers find tipping point in deforestation
University of Cincinnati geography researchers have identified a tipping point for deforestation that leads to rapid forest loss.

Amazon deforestation has a significant impact on the local climate in Brazil
The loss of forest cover in the Amazon has a significant impact on the local climate in Brazil, according to a new study.

Read More: Deforestation News and Deforestation Current Events
Brightsurf.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.