{"id":27853,"date":"2026-04-09T09:25:22","date_gmt":"2026-04-09T13:25:22","guid":{"rendered":"https:\/\/www.clarku.edu\/news\/?post_type=story&#038;p=27853"},"modified":"2026-04-09T21:22:24","modified_gmt":"2026-04-10T01:22:24","slug":"will-long-island-sound-residents-forgo-greener-lusher-lawns-to-protect-their-children-and-pets","status":"publish","type":"story","link":"https:\/\/www.clarku.edu\/news\/2026\/04\/09\/will-long-island-sound-residents-forgo-greener-lusher-lawns-to-protect-their-children-and-pets\/","title":{"rendered":"Will N.Y. and Conn. residents forgo greener, lusher lawns to protect their children and pets?"},"content":{"rendered":"\n\n\n<h2 class=\"wp-block-heading\" id=\"h-clark-economist-contributes-to-new-tool-aimed-at-curbing-fertilizer-hot-spots-and-polluted-waterways\">Clark economist contributes to new tool aimed at curbing fertilizer \u2018hot spots\u2019 and polluted waterways<\/h2>\n\n\n\n<p>With its 600 miles of coastline and 220 beaches, Long Island Sound generates a multi-billion-dollar \u201cblue economy\u201d for Connecticut and New York each year. The critical estuary harbors over 1,300 wildlife species, and millions of tourists and residents enjoy the Sound for fishing, boating, swimming, and other activities.<\/p>\n\n\n\n<p>Yet, for many years, the waterway has been threatened by\u00a0excess nitrogen pollution from sewage and lawn fertilizers that produce slow oxygen \u201cdead zones,\u201d killing fish and other marine life and producing unsightly algae. Since 2001, joint federal and state \u201cSave the Sound\u201d efforts have reduced nitrogen loads, but water monitoring by the <a href=\"https:\/\/lispartnership.org\/about\/about-the-study\/\">Long Island Sound Partnership<\/a> indicates that area residents could do more to curb pollution runoff.<\/p>\n\n\n\n<p>The question remains: How can this be accomplished?<\/p>\n\n\n\n<figure class=\"wp-block-image alignright size-medium is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"188\" src=\"https:\/\/www.clarku.edu\/news\/wp-content\/uploads\/sites\/37\/Robert-Johnston-web-300x188.avif\" alt=\"Robert Johnston, professor of economics and director of Clark\u2019s George Perkins Marsh Institute\" class=\"wp-image-27859\" style=\"width:400px\" srcset=\"https:\/\/www.clarku.edu\/news\/wp-content\/uploads\/sites\/37\/Robert-Johnston-web-300x188.avif 300w, https:\/\/www.clarku.edu\/news\/wp-content\/uploads\/sites\/37\/Robert-Johnston-web-1024x641.avif 1024w, https:\/\/www.clarku.edu\/news\/wp-content\/uploads\/sites\/37\/Robert-Johnston-web-768x480.avif 768w, https:\/\/www.clarku.edu\/news\/wp-content\/uploads\/sites\/37\/Robert-Johnston-web-1536x961.avif 1536w, https:\/\/www.clarku.edu\/news\/wp-content\/uploads\/sites\/37\/Robert-Johnston-web-1200x751.avif 1200w, https:\/\/www.clarku.edu\/news\/wp-content\/uploads\/sites\/37\/Robert-Johnston-web.avif 2000w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><figcaption class=\"wp-element-caption\">Robert Johnston, professor of economics and director of Clark\u2019s George Perkins Marsh Institute<\/figcaption><\/figure>\n\n\n\n<p>Enter principal investigator and Economics Professor <a href=\"https:\/\/www.clarku.edu\/faculty\/profiles\/robert-johnston\/\">Robert Johnston<\/a> of Clark University\u2019s <a href=\"https:\/\/www.clarku.edu\/schools\/climate-environment-and-society\/\">School of Climate, Environment, and Society (CES)<\/a>, director of Clark\u2019s <a href=\"https:\/\/www.clarku.edu\/centers\/marsh-institute\/\">George Perkins Marsh Institute<\/a>.<\/p>\n\n\n\n<p>Integrating the results of a two-year <a href=\"https:\/\/lispartnership.org\/2024\/05\/study-on-residential-fertilizer-use-helps-to-identify-nitrogen-hot-spots\/\">study<\/a>, he and colleagues at the University of Connecticut, University of Maryland, and University of Miami have released a <a href=\"https:\/\/experience.arcgis.com\/experience\/fdf001fd55c9450da7b61f3314adaf9c\/page\/Story-Map\">story map<\/a> and <a href=\"https:\/\/s.uconn.edu\/nfert\">tool<\/a> to help policymakers and the public understand the impacts of lawn fertilizers on the Sound\u2019s water quality. (The team\u2019s second <a href=\"https:\/\/www.clarku.edu\/news\/2025\/03\/27\/will-long-island-sound-residents-make-changes-to-help-protect-it\/\">study<\/a>, yet to be released, focuses on how to curb nitrogen pollution from aging residential septic tanks.)<\/p>\n\n\n\n<p>\u201cThe goal of this project was to provide the results that people need to make decisions on how to most effectively reduce water pollution due to lawn fertilizer\u2014in a simple, user-friendly format. Anybody can access the web map, for example, to reveal hotspots of lawn fertilizer use across the watershed,\u201d Johnston says. \u201cUsers can trace each step in the process, from predictions of who is applying fertilizer \u2014 how much and where \u2014 to what happens once that fertilizer hits the ground, and how much of the resulting nitrogen pollution reaches Long Island Sound.\u201d<\/p>\n\n\n\n<p>Funded by a two-year, $812,000 grant from the Long Island Sound Study and Connecticut Sea Grant, the study focused on the watershed and coastal areas surrounding Long Island Sound. The resulting \u201cLong Island Sound Lawn Fertilizer Outreach Targeting Tool\u201d covers roughly a 2,500-square-mile area with a population of 3 million people in Westchester, Fairfield, New Haven, Middlesex, and New London counties in Connecticut, and Nassau, Suffolk, and Suffolk counties on Long Island, New York.<\/p>\n\n\n\n<p>The tool pinpoints fertilizer-hotspot neighborhoods, not individual homes.<\/p>\n\n\n\n<p>\u201cThe tool has received considerable attention from policymakers and stakeholders, informing how they might want to design and target behavior-change campaigns for lawn fertilizer use,\u201d Johnston adds. \u201cIt helps them understand why targeting particular areas versus others would likely be more effective in reducing nutrient pollution to Long Island Sound.\u201d<\/p>\n\n\n\n<figure class=\"wp-block-pullquote\"><blockquote><p>\u201cIf you want to <em>really<\/em> have an impact on reducing nitrogen, you go where the fertilizer is \u2014 the larger lawns and newer, larger homes in less densely populated, exurban areas.\u201d<\/p><\/blockquote><\/figure>\n\n\n\n<p>Over the years, multiple studies across the U.S., including those focused on Long Island Sound, have pointed to exurban neighborhoods \u2014&nbsp;with newer, larger homes and bigger lawns \u2014 as contributing large amounts of nitrogen pollution from fertilizer use, according to Johnston. These studies are typically published in academic journals and are not intended to provide direct decision support.<br><br>\u201cCompared to the original academic research, this study takes three major steps forward \u2014 toward practical results that people can use to inform decisions,\u201d he says.<\/p>\n\n\n\n<p>Combining high-resolution geospatial data with a sample from surveys of single-family homes, the researchers predicted fertilizer use on residential lawns across the watershed. Then, they linked those predictions \u201cto a model identifying, at each point in the landscape, how much nitrogen from that fertilizer is expected to reach the water,\u201d Johnston explains. Finally, \u201cwe included additional study results to predict how different types of homeowners would react to particular types of behavior-change campaigns.\u201d<\/p>\n\n\n\n<p>Among the challenges faced by behavior-change campaigns for lawn care is the \u201cfree rider problem, where people don\u2019t change their own behavior because they think their neighbors will take responsibility,\u201d according to Johnston.<\/p>\n\n\n\n<p>\u201cIt\u2019s easy to imagine that our own actions won\u2019t matter \u2014 that it\u2019s just one lawn,\u201d he says. \u201cBut it\u2019s not one lawn \u2014 it\u2019s hundreds of thousands of lawns where everybody\u2019s making that same calculation.\u201d Among the goals of the study was to identify the types of behavior-change messages that are most likely to influence behavior.<\/p>\n\n\n\n<p>Johnston worked with University of Maryland researchers to develop models that would predict how \u2014 and why \u2014 residents might change their behaviors around fertilizer use. They based the models on the university\u2019s prior surveys distributed to residents around Long Island Sound.<\/p>\n\n\n\n<figure class=\"wp-block-pullquote\"><blockquote><p>\u201cWe found that messages focused on the potential exposure of local children and pets to lawn chemicals were particularly effective.\u201d <\/p><\/blockquote><\/figure>\n\n\n\n<p>The researchers found that when seeking to change residential fertilizer use, \u201cit\u2019s not only where you target, but it\u2019s the messages you use,\u201d he says. \u201cAcross the board, we find that the most effective approaches are not the types of approaches that people are currently using.\u201d<br><br>Typically, campaigns to curb lawn-fertilizer use are launched by nonprofit environmental organizations with limited resources, according to Johnston. They often target densely populated, urban neighborhoods because it\u2019s easier and cheaper to reach more people in those areas, and their messaging frequently focuses on improving water quality and protecting the environment.<\/p>\n\n\n\n<p>\u201cOur research shows that, in terms of impact, those are among the worst places to implement these campaigns, because even if they\u2019re effective at motivating people to change their behavior, so little of the nitrogen going to the Sound is coming from those areas,\u201d Johnston explains. \u201cWhy? Because the lawns in dense urban areas are often tiny, and the residents don&#8217;t tend to fertilize much.\u201d<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1187\" height=\"600\" src=\"https:\/\/www.clarku.edu\/news\/wp-content\/uploads\/sites\/37\/Lawn-map-nitrogen.avif\" alt=\"A screenshot of the map tool, with colored areas for low to high nitrogen loads.\" class=\"wp-image-27857\" srcset=\"https:\/\/www.clarku.edu\/news\/wp-content\/uploads\/sites\/37\/Lawn-map-nitrogen.avif 1187w, https:\/\/www.clarku.edu\/news\/wp-content\/uploads\/sites\/37\/Lawn-map-nitrogen-300x152.avif 300w, https:\/\/www.clarku.edu\/news\/wp-content\/uploads\/sites\/37\/Lawn-map-nitrogen-1024x518.avif 1024w, https:\/\/www.clarku.edu\/news\/wp-content\/uploads\/sites\/37\/Lawn-map-nitrogen-768x388.avif 768w\" sizes=\"auto, (max-width: 1187px) 100vw, 1187px\" \/><\/figure>\n\n\n\n<p>The researchers\u2019 map indicates these low-nitrogen areas, colored light pink (above), where behavior-change campaigns are predicted to have less impact on improving the Sound\u2019s water quality. They include places like New Rochelle, Great Neck, and Manhasset in New York, and Bridgeport, New Haven, and Waterbury in Connecticut.<\/p>\n\n\n\n<p>On the other hand, \u201cif you want to <em>really<\/em> have an impact on reducing nitrogen, you go where the fertilizer is \u2014 the larger lawns and newer, larger homes in less densely populated, exurban areas,\u201d he says.<\/p>\n\n\n\n<p>That would include high-nitrogen areas \u2014 colored dark red on the map \u2014 including parts of Greenwich, New Canaan, Newtown, Wallingford, and Colchester in Connecticut, and Harrison, Huntington, Oyster Bay, Smithtown, and Riverhead in New York.<\/p>\n\n\n\n<p>Yet, the researchers predict that messaging centered on water quality and the environment might not prove as effective in these areas.<\/p>\n\n\n\n<p>\u201cBased on our survey responses, we found that messages focused on the potential exposure of local children and pets to lawn chemicals were particularly effective,\u201d when seeking to motivate potential behavior change among homeowners. \u201cLawn chemical exposure is something local, tangible and important to people \u2014 that\u2019s what makes this type of message powerful.\u201d<\/p>\n\n\n\n<p>This new study \u201cdelivers practical results. It\u2019s designed to be clear and usable \u2014 you don\u2019t have to be a scientist to use it \u2014 and it overcomes one of the challenges that we sometimes have as academics: providing simple information to inform real-world decisions.\u201d<\/p>\n\n\n\n<p>In addition to Johnston, the researchers include co-principal investigators David Dickson and Jamie Vaudrey of the University of Connecticut and David A. Newburn of the University of Maryland; Haoluan Wang of the University of Miami; and Qian Lei-Parent of the University of Connecticut. Tom Ndebele, a research scientist&nbsp;at the George Perkins Marsh Institute, provided additional research support.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Clark economist contributes to new tool aimed at curbing fertilizer \u2018hot spots\u2019 and polluted waterways With its 600 miles of coastline and 220 beaches, Long Island Sound generates a multi-billion-dollar \u201cblue economy\u201d for Connecticut and New York each year. The critical estuary harbors over 1,300 wildlife species, and millions of tourists and residents enjoy the [&hellip;]<\/p>\n","protected":false},"featured_media":27856,"template":"","meta":{"story_color":"var(--clarku-color-green)","story_headerImg":27856,"section_label":"","footnotes":"","_links_to":"","_links_to_target":""},"categories":[241,246,245],"displayed_author":[242],"featured":[495],"topic":[521,160,162,134],"class_list":["post-27853","story","type-story","status-publish","has-post-thumbnail","hentry","category-environment-sustainability","category-health-wellbeing","category-social-sciences","displayed_author-meredith-woodward-king","featured-research","topic-environment","topic-faculty-research","topic-research","topic-school-of-climate-environment-and-society"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Will N.Y. and Conn. residents forgo greener, lusher lawns to protect their children and pets? | ClarkU News<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.clarku.edu\/news\/2026\/04\/09\/will-long-island-sound-residents-forgo-greener-lusher-lawns-to-protect-their-children-and-pets\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Will N.Y. and Conn. residents forgo greener, lusher lawns to protect their children and pets?\" \/>\n<meta property=\"og:description\" content=\"Clark economist contributes to new tool aimed at curbing fertilizer \u2018hot spots\u2019 and polluted waterways With its 600 miles of coastline and 220 beaches, Long Island Sound generates a multi-billion-dollar \u201cblue economy\u201d for Connecticut and New York each year. 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