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"With so many major drivers of change predicted to worsen," said one researcher, "it is expected that the increase of invasive alien species and their negative impacts, are likely to be significantly greater."
As wildfires burned through 3,200 acres of land on the Hawaiian island of Maui earlier this month, ultimately killing at least 115 people and destroying the city of Lahaina, some observers noted that the dry grasses that colonial occupiers introduced in the place of Hawaii's natural forests made the fires spread faster than they would have if the land had been left intact.
On Monday, a study resulting from nearly five years of research by experts from 49 countries revealed how the grasses are among thousands of harmful invasive alien species that have been introduced by human activities and placed communities across the globe at risk, with the human-driven climate emergency often exacerbating the negative impact of invasive plant and animal species.
The report by the Intergovernmental Platform on Biodiversity and Ecosystem Services (IPBES), titled the Assessment Report on Invasive Alien Species and Their Control, catalogues more than 3,500 harmful invasive species that are already "seriously threatening nature, nature's contributions to people, and good quality of life," with Indigenous communities facing the greatest threats.
The harmful invasive species are among 37,000 alien species that have been introduced by human activities such as colonization and trade, and that number is "now rising at an unprecedented rate," according to IPBES, making it likely that the species' harms will grow.
"The future threat from invasive alien species is a major concern," said Prof. Helen Roy, co-chair of the assessment and a researcher at the U.K. Center for Ecology & Hydrology. "Thirty-seven percent of the 37,000 alien species known today have been reported since 1970—largely caused by rising levels of global trade and human travel. Under 'business-as-usual' conditions, we project that total numbers of alien species will continue to increase in this way."
"But business-as-usual is actually unlikely," continues Roy. "With so many major drivers of change predicted to worsen, it is expected that the increase of invasive alien species and their negative impacts, are likely to be significantly greater. The accelerating global economy, intensified and expanded land- and sea-use change, as well as demographic changes are likely to lead to increases in invasive alien species worldwide... Climate change will make the situation even worse."
The report, which includes "very significant contributions from Indigenous peoples and local communities, making it the most comprehensive assessment ever carried out of invasive alien species around the world," found that nearly 80% of the documented impacts of invasive alien species on nature's contributions to people are negative, particularly as food supplies are damaged. The Caribbean false mussel, which researchers believe traveled from its native South and Central America to India via ships, has damaged local fisheries while the European shore crab has been blamed for the collapse of shellfish industries in New England.
In addition to damaging people's livelihoods, invasive species such as the Aedes albopictus and Aedes aegyptii—types of mosquitoes—can spread diseases such as malaria, Zika, and West Nile virus.
The global economic cost of invasive alien species has quadrupled every decade since 1970, exceeding $423 billion in 2019.
Invasive species are also a major driver of the majority of global plant and animal extinctions, and "the only driver in 16%" of extinctions recorded by IPBES.
"At least 218 invasive alien species have been responsible for more than 1,200 local extinctions," said Prof. Anibal Pauchard, co-chair of the study and an investigator at the University of Concepción's Institute of Ecology and Biodiversity. "In fact, 85% of the impacts of biological invasions on native species are negative."
For example, Pacific oysters—intentionally introduced in the North Sea in the 1960s to compensate for the loss of Indigenous oysters and support commercial fisheries—have overtaken mussel beds in the region, affecting the seabirds that feed on mussels and microorganisms living between them.
The researchers emphasized that having introduced invasive alien species to ecosystems around the world, humans have the power to mitigate the damage done by the species.
The report suggests prevention measures such as border biosecurity and import controls, which have been effective in reducing the spread of the brown marmorated stink bug in Australasia, and public awareness campaigns such as "Check, Clean, and Dry" in the U.K., which encourages people to check their boating equipment for aquatic animals or plants before leaving the water, clean equipment thoroughly, and dry it before using it again.
Inger Andersen, executive director of the United Nations Environment Program (UNEP), said the report fills "knowledge gaps" that remain around invasive species, as the effects of over-exploitation, climate change, and pollution on biodiversity are relatively well-understood.
"By providing critical information on trends in invasive species and policy tools to address them, this report can provide a springboard to concrete action on invasive species," said Andersen. "I ask all decision-makers to use this report's recommendations as a basis to act on this growing threat to biodiversity and human well-being."
The insect world's version of the ultramarathon is now taking place across the United States. Monarch butterflies have started their journey to the groves where they'll spend the winter. Monarchs west of the Rocky Mountains have a long trip to the California coast before them, while eastern monarchs have a hefty 3,000-mile trek to the forests of Mexico.
Despite their hardy nature, monarchs have suffered severe population losses. In the past several decades the eastern population has declined 80%, while its western counterpart has fared even more poorly. In the West, monarchs are at less than 0.1% of the population they had in the 1980s. Last year's winter count fell short of just 2,000 butterflies. These numbers reflect a very real threat of extinction for this iconic species.
America's pollinators face an imperiled future due to decades of exposure to toxic pesticides, disappearing habitat and a changing climate.
But there's hope, and it comes from an unexpected place: the Biden administration's infrastructure agenda.
In addition to supporting traditional infrastructure such as roads and bridges, the current version of the Infrastructure Investments and Jobs Act in Congress contains funding for pollinator-friendly roadsides, as well as provisions to revegetate areas devastated by invasive species.
Throughout the United States, there are 10 million acres of prime space for habitat along roadsides. Why not use it to rebuild populations for butterflies and bees? That's the opportunity before us, and the infrastructure bill would provide $2 million annually to relevant agencies for pollinator-friendly plantings. Grants of up to $150,000 would go toward much-needed projects for "planting and seeding of native, locally appropriate grasses and wildflowers, including milkweed." Other techniques to protect pollinators detailed in the bill--yes, it's that thorough--are as simple as reducing mowing frequency, timing mowing to avoid disturbing pollinators, and using pesticides more judiciously.
Roadside milkweed. Photo: Katie McVey/USFWS
None of these concepts are new. Earlier this year, similar language appeared in the Monarch and Pollinator Highway Act of 2021, a bill introduced by Rep. Jimmy Panetta (D-Calif.) and Sen. Jeff Merkley (D-Ore). Several years before that, the U.S. Department of Transportation issued best management practices for this type of roadside habitat. On a more local level, nine state departments of transportation--including those in California, Iowa and Florida--have led the way on these common-sense projects.
Another piece of the infrastructure bill would provide $50 million annually in grants to eliminate, control and prevent invasive plants, which throw native ecosystems out of balance. The Invasive Plant Elimination Program would prioritize funding to revegetation programs utilizing native plants and wildflowers, including pollinator-friendly species. This strategy offers a boon to pollinators and other wildlife in these healing ecosystems.
And they need the help. America's pollinators face an imperiled future due to decades of exposure to toxic pesticides, disappearing habitat and a changing climate. In addition to monarchs, one report found that more than half of native bee species in North America are in decline, including the rusty patched bumblebee. We need infrastructure that prioritizes these creatures.
Smooth coneflower growing under transmission lines. Photo: Caroline S. Krom, U.S. Fish and Wildlife Service, NC Sandhills Safe Harbor Coordinator
If we're wise, we'll invest in pollinator habitats for several reasons. First, given that insect pollinators contribute tens of billions of dollars of value to our agriculture, it makes economic sense to ensure they're abundant and healthy themselves. Roadside habitats near farms can increase pollination services and boost crop yields while reducing crop pests in the process.
Second, losing pollinators--especially native species--can have permanent ecological repercussions. Tremors in the web of life caused by the extinction of our pollinators affect animals that depend on them for food and nearly 90% of all flowering plants, including those that have co-evolved with these pollinators.
Third, losing monarch butterflies and other pollinators would make our lives less rich and less beautiful.
Endangered mission blue butterfly (Icaricia icarioides missionensis). Photo: Stuart Weiss/USFWS
Congress can help. While building roads and a more robust infrastructure system, Congress should also vote for the bill so we can build roadside habitats and increase the resiliency of pollinator populations. Providing diverse, healthy habitat will meet a long-neglected need for the thousands of native pollinators in the country. Along the way, it will help put these vital insects to work--for nature's benefit and for our own.
The work to save our pollinators will not end with the infrastructure bill, but with this added to the protections already in place, we can halt the monarch's flutter toward extinction.
Rapidly melting Arctic ice has exposed enormous swaths of this pristine and ecologically significant landscape to dangerous industrial threats. As officials meet this week to hammer out new rules that could potentially protect the region, environmental groups warn that the area known as the "Arctic Galapagos" is already in grave danger.
Scientists have reported that the Arctic is warming at nearly double the global average rate, which is one of the key factors driving an unprecedented ice sheet loss. This January saw a record low for sea ice extent in a troubling development.
These newly open waters have seen a surge in industrial activity, including fishing and shipping, which have been left largely unregulated, according to green groups.
Greenpeace releasedan investigation (pdf) on Wednesday that found that industrial fishing fleets are increasingly moving into Arctic waters, particularly the previously ice-covered Barents Sea, off of Norway.
"Sea ice loss in the northern Barents Sea is turning it into a new hunting ground for industrial fishing," Greenpeace states. "Fishing brings with it the threats of habitat degradation and bycatch, potentially wiping out marine life and putting this whole fragile ecosystem at risk."
The northern Barents Sea, known as the "Arctic Galapagos," is home to "a huge diversity of marine life including bowhead whales, walruses and polar bears, along with rare fish and invertebrates," the report states. It is also currently holds the largest cod stock in the world, which international fishing companies are rushing to exploit.
At the same time, environmentalists are raising concern about the uptick in shipping traffic moving through newly-open Arctic channels. Such traffic, warns John Kaltenstein, a marine policy analyst with Friends of the Earth (FOE), invites "the use of heavy fuel oil, harmful air emissions, and invasive species risk."
Less than 1.5 percent of the entire Arctic Ocean has any form of protected status. And while the International Maritime Organization's recently adopted Polar Code aims to establish a standard of safety for ships operating in Arctic waters, Kaltenstein notes that the actual text--expected to enter into force January 1, 2017--"does little to deal with the most urgent and far-reaching problems we face from Arctic shipping."
"Unfortunately, the shipping industry still behaves as if it were in the 1960s or 1970s, and the sad fact is that many countries both domestically and within international venues, such as the U.N.'s International Maritime Organization, coddle it," he states.
"It only takes one big spill to change everything," he continues, "remember Exxon Valdez. Incredibly, environmental policy surrounding Arctic shipping has become the equivalent of 'fingers crossed,' when it comes to grave threats such as heavy fuel oil spills, climate-warming emissions, and invasive species."
The warnings come as delegates from 15 European countries along with the European Union, known as the OSPAR commission, are meeting in Gothenburg, Sweden this week to discuss the formation of an Arctic Marine Protected Area (MPA) in the international waters north of Greenland.
Greenpeace describes the meeting, and the potential agreement, as a "make or break moment for Arctic protection."
"It is crucial that these areas are protected from destructive industrial activities, as they could be devastating for the species dependent on this area for survival," states the group, which notes that the region under consideration for protection "could be a potential habitat for ice-dependent species in the future as the ice melts in other places."
Ironically, Greenpeace notes that as international waters, the Arctic is part of the "global commons, belonging to all mankind." However, "there is no protection at all."