deforestation

Scientists confirm record highs for three most important heat-trapping gases

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https://www.theguardian.com/environment/2024/apr/06/record-highs-heat-trapping-gases-climate-crisis

A young woman protects herself from the sun in São Paulo, Brazil, on 14 November 2023. Photograph: Sebastião Moreira/EPA

Global concentrations of carbon dioxide, methane and nitrous oxide climbed to unseen levels in 2023, underlining climate crisis

The levels of the three most important heat-trapping gases in the atmosphere reached new record highs again last year, US scientists have confirmed, underlining the escalating challenge posed by the climate crisis.

The global concentration of carbon dioxide, the most important and prevalent of the greenhouse gases emitted by human activity, rose to an average of 419 parts per million in the atmosphere in 2023 while methane, a powerful if shorter-lasting greenhouse gas, rose to an average of 1922 parts per billion. Levels of nitrous oxide, the third most significant human-caused warming emission, climbed slightly to 336 parts per billion.

The increases do not quite match the record jumps seen in recent years, according to the National Oceanic and Atmospheric Administration (Noaa), but still represent a major change in the composition of the atmosphere even from just a decade ago.

Through the burning of fossil fuels, animal agriculture and deforestation, the world’s CO2 levels are now more than 50% higher than they were before the era of mass industrialization. Methane, which comes from sources including oil and gas drilling and livestock, has surged even more dramatically in recent years, Noaa said, and now has atmospheric concentrations 160% larger than in pre-industrial times.

Noaa said the onward march of greenhouse gas levels was due to the continued use of fossil fuels, as well as the impact of wildfires, which spew carbon-laden smoke into the air. Nitrous oxide, meanwhile, has risen due to the widespread use of nitrogen fertilizer and the intensification of agriculture.

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Because of a lag between CO2 levels and their impact, as well as the hundreds of years that the emissions remain in the atmosphere, the timescale of the climate crisis is enormous. Scientists have warned that governments need to rapidly slash emissions to net zero, and then start removing carbon from the atmosphere to bring down future temperature increases.

https://www.theguardian.com/environment/2024/apr/06/record-highs-heat-trapping-gases-climate-crisis

Continue ReadingScientists confirm record highs for three most important heat-trapping gases

Sweden has vast ‘old growth’ forests – but they are being chopped down faster than the Amazon

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Swedish old-growth forest.
Ulrika Ervander, Author provided

Anders Ahlström, Lund University and Pep Canadell, CSIRO

Most of Europe’s natural ecosystems have been lost over the centuries. However, a sizeable amount of natural old forest still exists, especially in the north. These “old-growth” forests are exceptionally valuable as they tend to host more species, store more carbon, and are more resilient to environmental change.

Many of these forests are found in Sweden, part of the belt of boreal forests that circle the world through Canada, Scandinavia and Russia. But after researching these last relics of natural forest we have found they are being cleared rapidly – at a rate faster even than the Amazon rainforest.

There is no direct monitoring of these forests, no thorough environmental impact assessments and most of the public don’t seem to be aware this is even happening. Other evidence suggests something similar is happening right across the world’s boreal forests.

It can be tricky to know exactly how much old-growth forest there is, since the distinction might not always be clear. However, there is a clear difference between forests that have been “clear-cut” (entirely chopped down) sometime in the past and those that never have.

Clear-cutting started appearing in Sweden in the early 1900s and has been the dominant type of forestry in the country since the 1950s. The uncut forests that predate this time have therefore most likely not been clear-cut and since they are old they can be classified as old-growth forests.

Logging machine in forest
Clear-cutting is still the main form of logging in Sweden.
Lasse Johansson / shutterstock

In our study, we looked specifically at forests in unprotected areas where the trees predated 1880 on average. That’s long before the large-scale adoption of clear-cutting in Sweden and means those forests have likely never been clear-cut.

These unprotected old-growth forests constitute around 8% of the productive forest land in Sweden, that is, the area that is generally favourable for forestry (omitting forests close to the Scandinavian mountain range tree line). This amounts to about 1.8 million hectares of old-growth forest, more than the total wooded area in many European countries.

This area of unprotected old-growth forest, with the remaining protected old-growth and primary forests, constitutes a large share of the last known ecosystems of “high naturalness” in the EU.

What is happening to these old-growth forests?

Between 2003 and 2019, 20% of all the clear-cut forest in Sweden was old-growth. This means a sizeable share of forest products, such as timber, paper and bioenergy, comes from old trees. The losses to unprotected old-growth forests amount to 1.4% per year, which means they will be lost completely by the 2070s if the trend continues.

To put this in perspective, Sweden’s old-growth forests have been cleared six to seven times faster than the Brazilian Amazon forest between 2008 and 2023. (Of course, given the size of the Amazon, the total amount of cleared forest is much larger there).

While our study, shockingly enough, appears to be the only of its kind across the boreal region, there is some research showing that old-growth forests are also harvested in Canada. Additional anecdotal evidence further suggests the unchecked loss of old-growth forests to forestry operations in other boreal regions .

What’s next?

The European Commission has drafted guidelines for all countries to map and protect all remaining old-growth and primary forests. This would be a good start.

But ultimately, we’ll need a coordinated system to map and monitor the entire boreal forest simply to learn the rate at which it is being lost. This would also help us understand the implications for carbon storage, for other plants and animals that live in these forests, and the humans that use them.

Unfortunately, this is a large and difficult task. Yet this might be one of our last chances to protect and recover large areas of natural forests. Logging old-growth forests now will delay their recovery for centuries.The Conversation

Anders Ahlström, Associate Professor, Department of Physical Geography and Ecosystem Science, Lund University and Pep Canadell, Chief Research Scientist, CSIRO Environment; Executive Director, Global Carbon Project, CSIRO

This article is republished from The Conversation under a Creative Commons license. Read the original article.

Continue ReadingSweden has vast ‘old growth’ forests – but they are being chopped down faster than the Amazon

Drought in the Amazon: Understanding the causes and the need for an immediate action plan to save the biome

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Lucas Ferrante, Universidade Federal do Amazonas (UFAM)

The drought plaguing the Amazon is a worrying portrait of the climate challenges facing the world. The combination of the El Niño phenomenon and anthropogenic climate change has played a significant role in accentuating this extreme weather event. The Amazon region, known for its lush rainforest and flowing rivers, is facing a critical situation due to a lack of rainfall and rising temperatures.

This phenomenon, never recorded at this intensity, has affected biodiversity and human life in eight Amazonian states. The drought has already killed more than 140 dolphins, including pink dolphins and tucuxis, also known as grey dolphins. The mortality of fish and other aquatic animals is also high. The low volume of the rivers affects the human supply, causing a lack of drinking water and food in all the small villages, even those located on the banks of the big rivers. Of the 62 municipalities in the state of Amazonas, 42 are in a state of emergency, 18 are in a state of alert and only two are in a normal situation.

The El Niño phenomenon has a direct influence on the Amazon drought. It manifests itself in the abnormal warming of the surface waters of the Pacific Ocean, affecting the rainfall regime in various parts of the world. In the case of the Amazon region, the drought is exacerbated by a decrease in humidity and a lack of rainfall, damaging the vegetation, fauna and local communities that depend on natural resources.

However, anthropogenic climate change is making the situation even worse. Rampant deforestation, driven by agricultural expansion and logging activity, reduces the Amazon rainforest’s ability to regulate the climate and retain moisture. In addition, the destruction of vast areas of vegetation contributes to rising temperatures, creating a cycle of even more accentuated droughts.

Deforestation and mining, major factors

Deforestation has been particularly devastating in the region of Highway BR-319, in the south of Amazonas state, driven by land grabbing which has provided cheap land to cattle ranchers from other states. In turn, this deforestation has increased the number of fires that feed back into the climate crisis. When they occur near riverbanks, deforestation also intensifies the phenomenon known as fallen land, which has drastically affected the draught of rivers and is already significantly jeopardising navigation and logistics, mainly affecting villages in the interior of the Amazon, which are already suffering from shortages.

Another factor that has played a significant role in affecting navigation is mining activity. Disorganised mineral extraction has created banks of land that are harmful to navigation and which, in the critical scenario of drought, have caused many vessels to run aground.

The impact of hydroelectric dams

Hydroelectric dams also play a role in contributing to the drought scenario, especially on the Madeira River. This is mainly due to the decomposition of organic matter in reservoirs created by dams, which releases methane, a potent greenhouse gas, into the atmosphere. In addition, deforestation associated with the construction of dams, as well as soil degradation and erosion resulting from the alteration of aquatic and terrestrial ecosystems, can increase emissions of carbon dioxide (CO2) and other pollutants, contributing to the impact of hydroelectric dams on climate change.

The Madeira River, now at its lowest level in almost 60 years, has been drastically affected and transformed by the Jirau and Santo Antônio hydroelectric dams. This was due to the drastic alteration of the river’s natural flow caused by the damming of water for power generation. When water is dammed, a reservoir is formed that retains part of the water that would normally flow along the river. This diversion of the flow directly affects the region’s aquatic and terrestrial ecosystems, since the basin’s hydrological cycle is interrupted. The reduction in the volume of water in the Madeira River, for example, can lead to prolonged periods of drought, affecting not only aquatic fauna and riparian habitats, but also local communities that depend on the river for their livelihoods.

In addition, the construction and operation of hydroelectric dams in the Amazon often involves the clearing of significant areas of forest for the construction of dams and associated infrastructure. Deforestation contributes to a reduction in evapotranspiration, which is a crucial process for water balance in the region. With fewer trees to release water into the atmosphere, the Amazon becomes more susceptible to drought. The combination of these factors results in a significant impact on the region, making hydroelectric dams one of the causes of drought in the Amazon, particularly on the Madeira River, with worrying environmental and social consequences.

What can still be done

In order to combat the extreme drought in the Amazon and its devastating effects, it is essential to adopt strict measures to curb deforestation and illegal mining in the region, and for the federal government to review major undertakings such as hydroelectric dams and roads, such as the BR-319 motorway.

Many politicians have argued that the road, if paved, could reduce the state’s isolation, especially during droughts. However, this is a fallacious argument, because connecting the most isolated municipalities would require hundreds of kilometres of side roads, which would further increase deforestation and aggravate the climate crisis.

In addition, the BR-319 motorway has become a spearhead that cuts through one of the most conserved blocks of forest, linking the central Amazon, which is still preserved, to the “arc of Amazonian deforestation”, a region that concentrates most of the climate anomalies in the entire biome.

Ecosystem on the edge

In a recent study published in the renowned journal Conservation Biology, it was shown that deforestation in the Amazon is already impacting ecosystem services that are essential for Brazil, such as the Amazon’s flying rivers. This scientific data shows that we are already at the threshold of deforestation and environmental degradation tolerated by the Amazon, and more forceful action needs to be taken now.

Part of this responsibility lies now in the hands of President Lula, in reviewing major developments in the Amazon, such as hydroelectric dams and highways like the BR-319. In addition, it is essential to institute a zero deforestation policy that should begin this year, and not in 2030, when it will be too late. Furthermore, it is crucial that the international community and local governments work together to reduce greenhouse gas emissions and tackle climate change effectively. Only with coordinated and decisive action will we be able to mitigate the impacts of drought in the Amazon and protect this unique ecosystem that plays a vital role in regulating the global climate.The Conversation

Lucas Ferrante, Pesquisador Vinculado ao Programa de Pós-graduação em Zoologia, Universidade Federal do Amazonas (UFAM)

This article is republished from The Conversation under a Creative Commons license. Read the original article.

Continue ReadingDrought in the Amazon: Understanding the causes and the need for an immediate action plan to save the biome

Study Finds Carbon Offset Schemes ‘Significantly Overestimating’ Deforestation Claims

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Original article by BRETT WILKINS republished from Common Dreams under Creative Commons (CC BY-NC-ND 3.0). 

“These carbon credits are essentially predicting whether someone will chop down a tree, and selling that prediction,” said one study author. “If you exaggerate or get it wrong, intentionally or not, you are selling hot air.”

Most carbon offset schemes significantly overestimate their impact on reducing deforestation, with many of the carbon credits purchased by polluting corporations amounting to little more than “hot air,” according to a researcher behind a study released Thursday that could portend billions of dollars in losses for speculators.

“Reducing emissions from deforestation and forest degradation (REDD) projects are intended to decrease carbon emissions from forests to offset other carbon emissions and are often claimed as credits to be used in calculating carbon emission budgets,” explains the study, which was published in the journal Science.

However, according to the study:

We examined the effects of 26 such project sites in six countries on three continents using synthetic control methods for causal inference. We found that most projects have not significantly reduced deforestation. For projects that did, reductions were substantially lower than claimed…

Methodologies used to construct deforestation baselines for carbon offset interventions need urgent revisions to correctly attribute reduced deforestation to the projects, thus maintaining both incentives for forest conservation and the integrity of global carbon accounting.

“Carbon credits provide major polluters with some semblance of climate credentials. Yet we can see that claims of saving vast swathes of forest from the chainsaw to balance emissions are overblown,” study co-author Andreas Kontoleon, from the University of Cambridge’s Department of Land Economy, said in a statement.

“These carbon credits are essentially predicting whether someone will chop down a tree, and selling that prediction,” he added. “If you exaggerate or get it wrong, intentionally or not, you are selling hot air.”

Kontoleon added that overestimations of forest preservation have driven an increase in the number of carbon credits on the market, resulting in artificial price suppression.

“Potential buyers benefit from consistently low prices created by the flood of credits,” he said. “It means that companies can tick their net-zero box at the lowest possible cost.”

This could mean that carbon speculators stand to lose billions of dollars in the future as offsets become stranded assets.

“It’s currently a buyer’s market and buyers are, rightly, prioritizing quality. There are over a billion tons of issued but not retired credits in the market—this suggests lots of credits can be written off, and there will remain a large supply for buyers to tap into,” Anton Root, head of research at AlliedOffsets, toldThe Guardian Thursday.

“A correction like that could help to orient the market toward fundamental supply-demand dynamics, which we don’t currently tend to see, and drive up the price for credits that are deemed to be above the quality threshold,” he added.

The new research follows other scientific research and journalistic investigations, including a January study by The Guardian, Die Zeit, and SourceMaterial that concluded that over 90% of the rainforest carbon offsets sold by Verra, the nonprofit organization that sets the world’s leading sustainability standard, “are largely worthless and could make global heating worse.”

While some scientists argue that CO2 extraction, either via natural or technological means, is needed in order to meet the goals of the Paris climate agreement, opponents call the technology a “false climate solution.”

Green groups including Extinction Rebellion and Food & Water Watch have for years warned against carbon capture and storage, which critics call a “scam” and “greenwashing.”

“Carbon offset markets are widely discredited,” Food & Water Watch policy director Jim Walsh said earlier this year. “Their only benefit lies in enriching the middlemen charged with selling the lie.”

Despite this, the Biden administration is pushing ahead with a plan to invest $2.5 billion in a pair of major carbon capture and storage projects, which it claims will “significantly reduce carbon dioxide emissions from electricity generation and hard-to-abate industrial operations” as part of the “effort critical to addressing the climate crisis and meeting the president’s goal of a net-zero emissions economy by 2050.”

Original article by BRETT WILKINS republished from Common Dreams under Creative Commons (CC BY-NC-ND 3.0). 

Continue ReadingStudy Finds Carbon Offset Schemes ‘Significantly Overestimating’ Deforestation Claims