The Global Land Analysis and Discovery System, otherwise known as GLAD, is a popular tool that flags disturbances to the global forest canopy which may be due to deforestation. Developed by the University of Maryland’s Global Land Analysis and Discovery laboratory, the system relies on NASA’s Landsat satellite imageries and is mainly designed to provide law enforcement authorities, local communities, and the like near-real-time alerts of potential deforestation activity. An interactive map showcasing the alerts is available on Global Forest Watch.
A recent study by Maffette et al. (2021) has shown that the benefit GLAD has brought extends beyond its primary role as an alert system. The study, which analysed deforestation rates across 22 nations between 2011 and 2018—the last five years before and two years after GLAD was launched—indicated that GLAD has resulted in carbon sequestration benefits worth hundreds of millions of dollars in just the first two years of its use; in Africa alone, it is estimated that the social cost of carbon for avoided deforestation, i.e., the measure of economic harm due to carbon dioxide emissions, was worth between USD149-696 million within that same time period. Interestingly, according to Moffette:
“We think that we see an effect mainly in Africa due to two main reasons. 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.”