By Ysabelle Kempe for Smart Cities Dive.
Broadcast version by Freda Ross for Texas News Service reporting for the Solutions Journalism Network-Public News Service Collaboration
Lately, the city of Dallas has been hearing from local leaders across the U.S. and as far as London, England, said Rosana Savcic, a division manager in the city's code compliance department. What has caught their attention? A city policy that took effect in 2017 requiring landlords to provide working air conditioning equipment.
More cities are looking into establishing a renter's right to cooling equipment as climate change drives record-breaking temperatures across the world. Such rules codify tenants' right to housing that can be cooled to a specific maximum indoor temperature, a number that varies from jurisdiction to jurisdiction. Tenants may still be on the hook for their energy bills, however.
Right now, cities that require landlords to provide AC systems are the exception, not the rule, says V. Kelly Turner, a heat policy researcher and associate director of the University of California, Los Angeles' Luskin Center for Innovation.
That may be changing. Montgomery County, Maryland, passed a first-in-the-region law in 2020 requiring many landlords to provide AC equipment capable of cooling units to at least 80 degrees Fahrenheit from June through September. A 2022 Chicago law requires some large residential buildings or buildings for older people to provide AC in common spaces when the outdoor heat index exceeds 80 F. A New Orleans rule went into effect this year mandating AC equipment that can cool bedrooms to at least 80 F.
In New York City's sustainability plan, the nation's largest city indicates its intention to develop a summer indoor maximum temperature policy by 2030. In July, a NYC council member introduced legislation that would require landlords to provide AC equipment in the summer. Los Angeles County officials are in the early stages of developing a similar policy.
The case for cooling
The trend toward cooling requirements is part of a broader recognition that climate change necessitates new protections and policies, experts say.
"What we're learning is we have to develop policies specific to the issue of heat," said Ashley Ward, director of Duke University's Heat Policy Innovation Hub. In addition to rental cooling standards, heat-specific policy needs include worker protections and universal cooling for schools and prisons, Ward notes.
The major challenge proponents of rental cooling standards need to overcome, Ward says, is the public perception that air conditioning is a luxury, not a necessity. That perception "is why we can justify not having air conditioning in prisons. Forty percent of our schools in the U.S. have inadequate HVAC," Ward said. But as heat records get broken again and again, and heat-related deaths escalate, proponents see policymaker attitudes shifting.
Limitations of right-to-cooling policies
While rental cooling standards may be a step toward addressing urban heat impacts on residents, these policies aren't perfect solutions, Ward said.
Even if lower-income renters have AC equipment, they might not turn it on for fear of high energy bills. That's why some experts have urged states and cities to complement rental cooling standards with utility bill assistance programs that take cooling needs into account. States typically use much more of the federal Low Income Home Energy Assistance Program to help people with heating rather than cooling bills. And while the need for support is growing, the pot of available LIHEAP funding shrank from $6.1 billion in fiscal year 2023 to $4.1 billion in fiscal year 2024, according to a June report from the National Energy Assistance Directors Association and Center for Energy Poverty and Climate.
Cities need to start monitoring low-income households' ability to pay for cooling, Turner said in an email. That data could build a case for better supporting cooling through subsidy programs like LIHEAP.
Utilities can also help make cooling more affordable, explained Gregory Pierce, research and co-executive director of UCLA's Luskin Center and an associate professor of urban planning. State public utilities commissions can play a big role in imposing or encouraging utility-run energy affordability programs, but cities can pitch in on the effort, too, such as by collaborating with utilities on programs that make baseline amounts of energy more affordable for people, Turner said.
Tiered payment programs, for example, charge those who use a lot of electricity a higher rate than those who use less. Hotter weather, however, might mean those tiers need to be adjusted, so that the most affordable tier accounts for the amount of energy needed to cool the typical home, Pierce said.
"Not a lot of utilities have, I think, adjusted those tiers accordingly yet to account for AC, much less electrification," he said.
Any equity-oriented program must involve listening to community members about their specific struggles, Turner added. "There may be solutions we don't even know to think about because we need to hear from those that would be facing those tough choices," such as between turning on the AC and putting food on the table, she said.
Rental cooling standards also present other challenges. Cash-strapped landlords may struggle to undertake complex, expensive retrofits. Waste heat that AC equipment generates increases the urban heat island effect, and adding cooling equipment to buildings can drive up greenhouse gas emissions - although heat pumps allow building owners to simultaneously offer cooling and potentially replace fossil fuel-powered HVAC equipment.
How low should cities go?
Then there's the question of what cities should set as the maximum temperature in rental housing. Dallas' rule requires AC equipment that can keep rooms at least 15 degrees cooler than the outdoor temperature, with a maximum temperature threshold of 85 F. That means that even if it's 105 degrees outside, rental housing must be equipped to stay at 85 F or cooler.
Ward thinks cities should set the maximum temperature lower. She cites 73 F as the threshold for a good night's sleep and recovery. She recommends cities set a maximum temperature around 76 F, since fans can help bring the temperature down another couple of degrees.
However, over-debating the exact maximum temperature can stifle productive policymaking, Turner warned. She said she'd rather set the maximum temperature at 80 F and start a conversation about what it will take to implement the policy, including developing a complaint-reporting process and finding funding.
"To some degree, the question isn't, 'Can we get exactly [the right] temperature?' The question is, 'Can we get something on the books to at least give people a fighting chance of having a safe thermal environment?'" she said. "Once we do that, we can start to tinker."
Ysabelle Kempe wrote this article for Smart Cities Dive.
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Conservation groups in Maine are calling on the state's congressional delegation to protect federal funding for clean energy technologies.
A new report found the state has benefited from more than $2 billion in clean energy investments stemming from the Inflation Reduction Act and Bipartisan Infrastructure Law.
Jack Shapiro, climate and clean energy program director for the Natural Resources Council of Maine, said many of the programs have helped low-income and rural communities.
"From a cost saving perspective, from an energy independence perspective, from a climate perspective, this is the right path to be on," Shapiro asserted. "We hope that we continue to have federal support to do that."
Shapiro pointed out the state has received millions of additional dollars in climate resilience funding to better prepare for extreme weather events. The Trump administration is reported to be exploring ways to cancel already approved loans for clean energy and redirect those funds toward nuclear power and liquefied natural gas.
Maine has set an ambitious goal of reaching net-zero emissions by 2045 and the state has directed millions of dollars toward offshore wind energy projects, an electric vehicle charging network and electric heat pumps.
Shapiro noted all corners of the state are benefiting from energy investments, including efforts to improve electric grid reliability.
"Power outages are a frequent occurrence and that can be addressed by local energy production, like solar and local energy storage and microgrids," Shapiro outlined. "A number of these investments have gone to support those things as well."
Shapiro added federal funding has also created good-paying jobs. The state's clean energy sector grew three times faster than the state's overall economy between 2016 and 2022 and now employs more than 15,000 people. Gov. Janet Mills has set a goal of 30,000 clean energy workers by 2030.
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Addressing Colorado's rising cost of living and protecting clean air and water are priorities for Democratic Representative Emily Sirota of Denver in the current legislative session.
Sirota recently introduced House Bill 1090 to regulate so-called junk fees charged by landlords.
The bill would protect tenants from getting bills that can add hundreds of dollars to their monthly rent, for things such as valet trash service, internet service, surcharges on rent payments, pest control and more.
"All sorts of additional fees are being added to folks' bill," Sirota pointed out. "We think if landlords want to charge those fees, they should be reflected in the rent."
Some see junk fees as deceptive and unfair trade practices, because landlords advertise one price to lure renters, but the price is not what they will actually have to pay. Industry groups argued fees are necessary to recoup hard costs and added out all fees are listed in black in white before tenants sign their leases.
Sirota has also introduced House Bill 1011, a measure to add guardrails as private equity firms buy up child care operations, firms already disrupting housing and health care markets.
"And really has been to the detriment of consumers in those sectors because their traditional business model is to increase prices or fees and drive down wages," Sirota observed.
The Trump administration has once again abandoned a promise the U.S. made in Paris nearly 10 years ago to combat climate change, and has instead promised to ramp up fossil fuel production and remove environmental protections. Sirota believes state lawmakers still have a role to play.
"We are trying to make sure that Colorado is able to protect its air and water and meet our climate goals, as we see this being unwound federally," Sirota explained.
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By Gabriella Sotelo for Sentient.
Broadcast version by Judith Ruiz-Branch for Illinois News Connection reporting for the Sentient-Public News Service Collaboration
Nitrous oxide (N2O) emissions from agriculture are not only coming from soil. They’re also flowing through the streams that run alongside farms, a recent study finds. Researchers at the University of Minnesota and University of Illinois discovered more than one-third of regional nitrous oxide emissions were measured from streams.
While often overshadowed by the more widely known greenhouse gases like carbon dioxide and methane, nitrous oxide is the third-largest contributor to greenhouse gas emissions. Nitrous oxide also has an EPA-rated “Global Warming Potential” 273 times that of carbon dioxide (over a 100-year timescale), and is a significant contributor to ozone depletion. This means that even small amounts of nitrous oxide emissions can have a disproportionately large impact on global warming. And the flip side is also true: taking some action, including better manure management and eating less meat, can have a big climate impact for the better.
The discovery highlights a previously overlooked pathway for nitrous oxide to enter the atmosphere: as agricultural soils undergo the process of nitrification and produce nitrous oxide, the gas is transported via runoff into nearby streams. During the nitrification process, bacteria in soils break down ammonia — in this case from fertilizers — into nitrates that can produce nitrous oxide gas. While this gas may be released immediately from the soil, it can also become trapped in the soil or dissolve in water, only to be carried into streams during rainfall or snowmelt.
“What we basically found is there [are] other pathways, and this stream emission could be important,” Zhongjie Yu, hydrologist and researcher in the study, tells Sentient.
Traditionally, when researchers consider nitrous oxide emissions from agriculture, they focus on soil. Excess nitrogen from fertilizers accumulates in agricultural soil, where it can be transformed into nitrous oxide, and released directly into the atmosphere. However, this new study suggests that emissions from streams — carrying runoff from agricultural fields — can be just as important, if not more so, in certain regions. Factory farms can be a major driver of this issue, as these operations produce large amounts of waste, composed partly of nitrogen.
When researchers consider initial nitrous oxide emissions, it’s often in the context of fertilizer input to soil. This excess nitrogen accumulates in agricultural soil, and can then lead to the direct release of nitrous oxide into the atmosphere.
Though the study used only the University of Minnesota’s Tall Tower Trace Gas Observator to sample air emissions, Yu and his research team are confident about the data.
“We found that N2O is emitted from streams, but we believe it’s originally from fertilizer nitrogen. It is just carried by water, and gets emitted from those aquatic systems. It’s not saying it’s a natural source, but it’s still related to fertilizer nitrogen. But it just provides another pathway that N2O gets lost from some land to the atmosphere.”
Yu also emphasized that agriculture is the dominant source of human-caused nitrous oxide emissions. This study not only challenges the conventional understanding of agricultural emissions, but also underscores a broader issue: agricultural runoff is not just a water quality problem — it is also a major contributor to climate change.
Nitrous Oxide: the Lesser Known Climate Threat
Human activities are significant contributors to nitrous oxide emissions. While other natural sources, such as the ocean, also release nitrous oxide, agricultural practices — particularly fertilizer application — are by far the largest contributor of anthropogenic emissions.
This gas is primarily produced when nitrogen-based fertilizers and manure are applied to agricultural soils. Microbes in the soil convert this nitrogen into nitrous oxide through processes such as nitrification and denitrification. The situation is made worse by the practices of industrial farming, which rely heavily on the use of synthetic fertilizers and animal waste.
Around 12 million tons of nitrogen are applied to crops each year in the United States. An EPA report found that agricultural soil management — like fertilizer use and other practices that boost nitrogen levels in the soil — accounts for nearly 75 percent of the United States’ nitrous oxide emissions. Within the agricultural sector itself, it makes up almost half of all emissions.
These soil management practices are primarily intended to optimize crop production, but much of the land is used for growing farm animal feed and biofuel crops. In 2020, only a small fraction of corn grown in the U.S. — less than two percent — was used for direct human food. Around 31 percent was dedicated to biofuels such as ethanol, while the majority, around 35 percent, went toward feeding livestock. With global meat consumption steadily rising, the demand for animal feed is expected to increase, further driving the need for feed crops like corn — along with higher fertilizer use and a corresponding rise in nitrous oxide emissions.
And now, the source of these emissions isn’t just the soil. Stream emissions can contribute to a much larger portion of annual nitrous oxide emissions than researchers previously thought.
“The high contribution of stream emissions suggests that soil emissions may have been overestimated in current regional nitrous oxide budgets,” Yu writes.
Yu points out that the link between agricultural runoff and stream emissions has often been overlooked in past research. Traditional methods use soil chambers to measure nitrous oxide emissions, a method that places a closed chamber over the soil, in order to capture any gases emitted from it. This approach primarily measures how much nitrous oxide is released directly from the soil, but misses the nitrogen that leaches out of the soil and flows into water systems, where it can then be converted into nitrous oxide and emitted to streams.
The Bottom Line
The source of nitrous oxide emissions from agriculture is more complex than scientists once thought. While traditional efforts to reduce nitrous oxide emissions have focused mainly on fertilizer management and improving soil efficiency, this new discovery emphasizes the importance of looking at the entire agricultural system, including runoff into streams. If the number of factory farms continue to rise, there is likely to be a rise in nitrous oxide pollution, particularly in streams, due to greater fertilizer use and runoff.
Yu mentions that improving water and nutrient management not only benefits water quality, but can also be a crucial tool in reducing greenhouse gas emissions. Fertilizer and manure runoff, especially from factory farms, can carry large quantities of nitrogen into waterways, which may then be converted into nitrous oxide — further complicating efforts to mitigate emissions from agriculture.
“We need to be a little bit careful here, because that water gets leached from surface soil and can end up in streams and rivers, carrying a lot of that greenhouse gas to those systems and having an impact there,” Yu says.
Gabriella Sotelo wrote this article for Sentient.
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