Yu Feng, Alan D. Ziegler, Paul R. Elsen, Yang Liu1, Xinyue He, Dominick V. Spracklen, Joseph Holden, Xin Jiang1, Chunmiao Zheng and Zhenzhong Zeng
Southeast Asia contains about half of all tropical mountain forests, which are rich in biodiversity and carbon stocks, yet there is debate as to whether regional mountain forest cover has increased or decreased in recent decades. Here, our analysis of high-resolution satellite datasets reveals increasing mountain forest loss across Southeast Asia. Total mean annual forest loss was 3.22 Mha yr−1 during 2001–2019, with 31% occurring on the mountains. In the 2010s, the frontier of forest loss moved to higher elevations (15.1 ± 3.8 m yr−1 during 2011–2019, P < 0.01) and steeper slopes (0.22 ± 0.05° yr−1 during 2009–2019, P < 0.01) that have high forest carbon density relative to the lowlands. These shifts led to unprecedented annual forest carbon loss of 424 Tg C yr−1, accelerating at a rate of 18 ± 4 Tg C yr−2 (P < 0.01) from 2001 to 2019. Our results underscore the immedi-ate threat of carbon stock losses associated with accelerating forest clearance in Southeast Asian mountains, which jeopardizes international climate agreements and biodiversity conservation.
By Oliver Milman
An area of forest the size of France has regrown around the world over the past 20 years, showing that regeneration in some places is paying off, a new analysis has found.
Nearly 59m hectares of forests have regrown since 2000, the research found, providing the potential to soak up and store 5.9 gigatonnes of carbon dioxide – more than the annual emissions of the entire US.
The two-year study, conducted via satellite imaging data and on-ground surveys across dozens of countries, identified areas of regrowth in the Atlantic forest in Brazil, where an area the size of the Netherlands has rebounded since 2000 due to conservation efforts and altered industry practices.
Another regrowth area is found in the boreal forests of Mongolia, where 1.2m hectares of forest have regenerated in two decades due to the work of conservationists and the Mongolian government. Forests also made a comeback in parts of central Africa and Canada.
However, the world is still experiencing an overall loss of forests “at a terrifying rate”, the researchers warned, with deforestation occurring much faster than restoration schemes.
Over a similar period outlined in the regrowth study, which was led by WWF as part of the Trillion Trees project, 386m hectares of tree cover were lost worldwide, around seven times the area of regenerated forest.
By Eric Hamilton
Deforestation dropped by 18 percent in two years in African countries where organizations subscribed to receive warnings from a new service using satellites to detect decreases in forest cover in the tropics.
The carbon emissions avoided by reducing deforestation were worth between $149 million and $696 million, based on the ability of lower emissions to reduce the detrimental economic consequences of climate change.
Those findings come from new research into the effect of GLAD, the Global Land Analysis and Discovery system, available on the free and interactive interface Global Forest Watch. Launched in 2016, GLAD provides frequent, high-resolution alerts when it detects a drop in forest cover. Governments and others interested in halting deforestation can subscribe to the alerts on Global Forest Watch and then intervene to limit forest loss.
A documentary about the burning of wood at an industrial scale for energy, “BURNED: Are Trees the New Coal?” tells the little-known story of the accelerating destruction of our forests for fuel, and probes the policy loopholes, huge subsidies, and blatant greenwashing of the burgeoning biomass power industry.
By independent filmmakers Marlboro Films, LLC: Alan Dater, Lisa Merton, and Chris Hardee.
A study carried out by the IIRS has predicted a depletion of 9,007.14 square km (2.94 per cent) of forests in parts of Assam and Arunachal Pradesh by 2028.
A report published in the The Telegraph stated that the study – ‘Forest Cover Monitoring and Prediction in a Lesser Himalayan Elephant Landscape’ – published in the current issue of Current Science, says deforestation and loss of wildlife habitat in Upper Assam is likely to influence not only adjoining Bhutan and Arunachal Pradesh but Lower Assam as well. The IIRS is under the Indian Space Research Organisation (ISRO).
The report further stated that scientists involved in the study said they monitored the depletion of forest cover in parts of Assam and Arunachal Pradesh over 42,375 square km in an elephant landscape falling in the Lesser Himalaya in the North East. The study, which covered a vast elephant landscape spread across West Bengal-Assam, Assam-Bhutan and Assam-Arunachal Pradesh borders in the lesser Himalayas, found a loss of about 7,590 square km (17.92 per cent) of forest cover from 1924 to 2009.
This was also found by US Army topographic maps (1924) and multi-date satellite images. The forest cover of 2028 was predicted using the 2000-2009 depletion of forests study and Cellular Automata Markov Model (CAMM). As elephants are long-ranging animals and are distributed across the landscape, it is important to carry out studies covering large areas to address the habitat status over time, which can be used for effective habitat conservation.
By Jade Boyd
Widespread logging and hunting have endangered virtually all of Madagascar’s 100-plus species of iconic lemurs, and a new study by Rice University ecologists illustrates how saving the animals may also be key to saving the island’s largest trees.
“Forest loss is a huge problem in Madagascar right now, but our study suggests that just saving the trees is not enough,” said Amy Dunham, associate professor of biosciences at Rice and co-author of a paper appearing online today in a special issue of the International Journal of Primatology. “Not only are we facing the loss of these unique, charismatic animals, we’re also losing their role in the ecosystem. Without lemurs, the rainforests themselves will change because the lemurs alone disperse the seeds of many of the forests’ largest hardwoods.”
The study builds upon nearly a decade of collaborative work by Dunham and lead author Onja Razafindratsima at the island nation’s Ranomafana National Park.
Lemurs mostly eat fruit, and for many of the largest trees in Madagascar, lemurs are the only animals large enough to ingest the seeds of their fruit. By dispersing seeds throughout the forest in their scat, lemurs serve as the unwitting gardeners of these large canopy trees.
By John Sullivan, Office of Engineering Communications
Researchers using satellite imaging have found much greater than expected deforestation since 2000 in the highlands of Southeast Asia, a critically important world ecosystem.
Zhenzhong Zeng, a postdoctoral researcher at Princeton University and the lead author of a July 2 article describing the findings in Nature Geoscience, said the researchers used a combination of satellite data and computational algorithms to reach their conclusions. The report shows a loss of 29.3 million hectares of forest (roughly 113,000 square miles or about twice the size of New York state) between 2000 and 2014. Zeng said that represents 57 percent more loss than current estimations of deforestation made by the International Panel on Climate Change. He said most of the forest has been cleared for crops.
Because forests absorb atmospheric carbon, and burning forests contribute carbon to the atmosphere, loss of forests could be devastating. An accurate estimation of forest cover also is critical for assessments of climate change. Zeng also said transformation of mountainous regions from old forest to cropland can have widespread environmental impacts from soil retention to water quality in the region.
By Damian Carrington, Niko Kommenda, Pablo Gutiérrez and Cath Levett
Global deforestation is on an upward trend, jeopardising efforts to tackle climate change and the massive decline in wildlife.
Global tree cover losses have doubled since 2003, while deforestation in crucial tropical rainforest has doubled since 2008. A falling trend in Brazil has been reversed amid political instability and forest destruction has soared in Colombia.
In other key nations, the Democratic Republic of Congo’s vast forests suffered record losses. However, in Indonesia, deforestation dropped 60% in 2017, helped by fewer forest fires and government action.
Forest losses are a huge contributor to the carbon emissions driving global warming, about the same as total emissions from the US, which is the world’s second biggest polluter. Deforestation destroys wildlife habitat and is a key reason for populations of wildlife having plunged by half in the last 40 years, starting a sixth mass extinction.
By Mike Gaworecki
New research provides yet more evidence that granting indigenous and other local communities formal title to their traditional lands can be a boon to efforts to conserve forests.
Deforestation is responsible for as much as 10 percent of total global carbon emissions, which means that finding effective means of keeping forests standing is crucial to global efforts to halt climate change.
Previous studies have found that securing indigenous land rights is a successful path to keeping forests and the carbon sinks they represent intact. A 2016 analysis by the World Resources Institute (WRI) focused on Bolivia, Brazil, and Colombia, for instance, determined that tenure-secure indigenous forestlands could help avoid the release of carbon emissions equivalent to taking nine to 12 million passenger vehicles off the road over the next 20 years.
According to another report released last year as part of a collaborative research project by the Woods Hole Research Center, the Rights and Resources Initiative, and WRI, there is a lot of carbon stored on indigenous lands, making increased land titling a significant opportunity for climate mitigation. But the research found that, while indigenous peoples and other local forest communities manage at least 24 percent of the carbon stored above-ground in Earth’s tropical forests, or some 54,546 million metric tons of carbon (MtC), more than 22,000 MtC of that is at risk of deforestation or degradation because it is found in regions where the local communities do not enjoy formal recognition of their claim to the land.
A more recent study not only found that well-trained indigenous technicians are every bit as capable of collecting the necessary data to monitor forest carbon stocks as professionals, but that in some cases, at least, they can do it quicker and cheaper than the professionals.
The efficacy of land titling as a forest protection measure are less clear, however. But now the authors of a study published in the Proceedings of the National Academy of Sciences (PNAS) last week say they found that forest clearance is actually reduced by more than three-quarters and forest disturbance by roughly two-thirds over the two-year time span immediately following the granting of land title to an indigenous community.
Clear-cutting of tropical mangrove forests to create shrimp ponds and cattle pastures contributes significantly to the greenhouse gas effect, one of the leading causes of global warming, new research suggests.
A seven-year study, led by Oregon State University and the Center for International Forestry Research, spanned five countries across the topics from Indonesia to the Dominican Republic. The researchers concluded that mangrove conversion to agricultural uses resulted in a land-use carbon footprint of 1,440 pounds of carbon dioxide released into the atmosphere for the production of every pound of beef; and 1,603 pounds of released carbon dioxide for every pound of shrimp.