Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Minnesota Sea Grant Study Shows Protecting Local Water has Global Benefits

Story by Marie Thoms, Minnesota Sea Grant

 

A new paper in Nature Communications online demonstrates why keeping local lakes and other waterbodies clean produces cost-effective benefits locally and globally.

 

A single season of a lake or water body with a harmful algal bloom that results in public do-not-drink orders, damages to fishing activity, lost recreational opportunities, decreased property values and increased likelihood of low birth weight among infants born to mothers exposed to polluted water bodies are but just a handful of reasons why clean water is important.

 

Most everyone wants their local lake or stream to be clean and usable for drinking, fishing, swimming and recreation. But previous cost-benefit studies showed the costs of protecting local water sources often exceeded the benefits.

 

Not so fast say the authors. One of the reasons past studies showed costs exceeding benefits is that not all benefits, especially global ones, were analyzed by economists.

 

New research, led by Minnesota Sea Grant Director John A. Downing, found that adding up global financial benefits of clean water shows that keeping water clean can help slow climate change, saving trillions of dollars. Using one Lake Erie case study as an example, the authors also found that the global climate change value of protecting and preventing this Great Lake from algae blooms was ten times greater than the value of beach use or sport fishing.

 

“Surface water is one of the Earth’s most important resources,” said Downing, who is also a lake scientist at the University of Minnesota Duluth Large Lake Observatory. “Yet people have mistakenly assumed that it costs more to protect our water than it is worth. Our research demonstrates that there is significant local and global value to protecting local water quality.”

 

One reason for this, said the authors, is that scientists and economists have previously considered only a narrow range of local benefits when calculating the outcomes of good water quality. Downing and co-authors sought to calculate the potential global benefits.

 

Locally, cleaning or keeping a local lake or waterbody free of unwanted nutrients– what scientists call eutrophication – is obviously good for people who use or want to access that particular water body. Globally, it’s also good for reducing the amount of the greenhouse gas methane that is released into the atmosphere from that eutrophic water body.

 

Methane is a stronger greenhouse gas than carbon dioxide because it has a much higher heat-trapping ability and has about 21 times the global warming potential of carbon dioxide. Less methane in the atmosphere can help slow global warming.

 

The authors sought to answer the question: is keeping a local water body clean worth the cost?

 

The cost of climate change comes from healthcare costs, damages to urban infrastructure, agricultural damages, catastrophic storm damage, negative impacts on recreation, forestry, fisheries, energy systems, water systems, construction, and coastal infrastructure. 

 

“We calculated the global climate damages from methane emissions from eutrophic lakes and calculated the damages that would be avoided by preventing increased emissions from 2015 to 2050,” said Downing. “If we could hold methane emissions at current levels rather than the expected 20-100% increase by 2050, the value of avoiding the resulting damages could be as much as $24 trillion.” The authors estimated the costs of global climate change due to eutrophication from 2015 to 2050 to be as much as $81 trillion.

 

The authors’ analysis shows that local water quality protection has global economic implications. The substantial emissions they document from lakes and reservoirs and the potential for increased emissions suggest that there is considerable value to be gained by improving water quality in lakes and reservoirs and in preventing further deterioration.

 

“It’s not possible to avoid all emissions from lakes and reservoirs, but with concerted effort, it may be possible to prevent increased emissions or even reverse it,” said Downing.

 

Related Posts
Oysters in a pair of gloved hands
Announcements

NOAA Sea Grant Develops 5-Year Aquaculture Investment Plan

Year-over-year, Sea Grant is committed to supporting aquaculture development across the nation, as a means of enhancing economic resilience and nutritional security in American communities. Sea Grant recently developed a five-year Aquaculture Investment Plan to guide its efforts in supporting aquaculture research, extension and education.

Read More >
(top left) A hand holding a pen traces a map for determining flood risk; (top right) an aerial view of waterfront property flooding; (bottom left) a walkway to docked fishing boats on the left and right; (bottom right) a person speaking and pointing to a flipchart while other participants listen.
Climate

NOAA Sea Grant Advances Resilient Coastal Communities with $4 Million in Support

Sea Grant programs across the U.S. are scaling up capacity to support additional hands-on, collaborative engagement to advance the sustainability of coastal and Great Lakes communities. Sea Grant awarded $4 million in fiscal year 2023 funds to its grant-based programs nationwide to continue or expand ongoing work or address new opportunities for coastal climate adaptation and resilience for the communities that Sea Grant serves.

Read More >
Scroll to Top