Extreme Temperature Diary- Monday March 17th, 2026/Main Topic: Reduced Physical Activity Due to Global Heating Will Lead to Rise in Health Issues

Reduced physical activity due to global heating will lead to rise in health issues, study says | Climate crisis | The Guardian

Health and climateClimate crisis

Reduced physical activity due to global heating will lead to rise in health issues, study says

Researchers project that reduced activity could contribute to half a million additional premature deaths annually by 2050

Health and climateClimate crisis

Chloé Farand

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Rising temperatures are making physical activity undesirable and even dangerous in many parts of the world, and as global heating worsens, it will further affect how much people are able to move.

Researchers analysed data from 156 countries between 2000 and 2022 and modelled how rising temperatures may affect physical activity globally by 2050.

They found that each additional month with an average temperature above 27.8C would increase physical inactivity by an average of 1.5 percentage points globally, with an even higher increase of 1.85 points in low and middle-income countries.

Physical inactivity increases the risk of cardiovascular disease, type 2 diabetes, certain cancers and mental health disorders, all of which shorten life expectancy, said the study’s lead author, Christian García-Witulski, a research fellow at the Lancet Countdown Latin America and a professor at the Pontifical Catholic University of Argentina.

Reduced physical activity is already a big global health problem and is responsible for an estimated 5% of all adult deaths, according to the study, which was published in the Lancet Global Health journal. About a third of the world’s population fails to meet World Health Organization guidelines for weekly exercise.

The study projects that the increase in physical inactivity could contribute to about half a million additional premature deaths annually and $2.4bn – $3.68bn in productivity losses by 2050.

The biggest increases in inactivity are projected to be in hotter regions such as Central America, the Caribbean, eastern sub-Saharan Africa, and equatorial south-east Asia, where inactivity could rise by more than four percentage points a month.

“This is not just a climate story, it is also an inequality story. The places expected to face the greatest increases in climate-driven inactivity are often the same places with fewer resources to adapt,” said García-Witulski.

“In settings where people have less access to cooling, fewer safe indoor alternatives, and less flexibility in their daily schedules, heat appears more likely to translate into reduced physical activity.”

The model also predicted a bigger increase in inactivity among women, which could reflect physiological differences as well as social factors, such as less time and access to cool places for exercise, said García-Witulski.

The findings are modelled projections based on self-reported activity surveys and don’t account for other climate impacts such as extreme rainfall, flooding and tropical cyclones.

The authors say the results show that physical activity should be treated as a climate-sensitive public health issue, not just an individual lifestyle choice.

“Staying active in a warming world depends not only on personal motivation, but also on urban design, infrastructure and access to reliable information. In practical terms, climate-resilient physical activity policies are those that help people remain active safely even under hotter conditions,” said García-Witulski.

That includes designing cooler cities by expanding the tree cover and shade networks in streets and parks, providing affordable air-conditioned places to exercise, and giving clear advice on how to stay safe in extreme heat, as well as ambitious emissions reductions.

Heatwave for the Ages!! Starts today in the US Southwest. The hottest temperatures ever experienced in March in the US, and not just one day, multiple days, into next week! The US all-time hottest March record will likely be crushed and we may even challenge the US record for April! #heatwave

Jeff Berardelli (@weatherprof.bsky.social) 2026-03-17T16:18:53.800Z

Remarkable. 114 is the official NOAA forecast for Mecca, CA on Friday. That would not only beat the March US record (107 in Mecca) but also the April US record of 113 in Death Valley. #heatwave

Jeff Berardelli (@weatherprof.bsky.social) 2026-03-16T20:58:31.110Z

♨️This week: a prolonged heat wave will push temperatures 20-30°F above normal across much of the western U.S.🌡️Dozens of daily and all-time March records expected…including the earliest 100°F temps on record.A short 🧵

Climate Central (@climatecentral.org) 2026-03-16T23:42:59.979Z

🌡️ Many Bay Area sites are nearing historic highs today through March 20. Yesterday, Redwood City hit a record 90°F—the hottest it’s been there in March since record-keeping began! Napa’s all-time March record (92°F) still stands fr… https://x.com/NWSBayArea/status/2033957323786289227

NWS Bay Area Bot (@nwsbayareabot.bsky.social) 2026-03-17T17:31:58.734908Z

In case you missed it live yesterday, this historic heatwave and "assorted extreme weather"-focused session was recorded and is available via the same link below.

Daniel Swain (@weatherwest.bsky.social) 2026-03-17T20:02:02.225Z

World’s worst mega-leaks of the potent greenhouse gas methane in 2025 have been revealed by an analysis of satellite data.www.theguardian.com/environment/…

Dr Paul Dorfman (@drpauldorfman.bsky.social) 2026-03-17T10:02:34.463Z

BREAKING: University Center for Atmospheric Research (UCAR) files suit against NSF, OMB, NOAA and DOC to halt alleged "violations of the Constitution and Administrative Procedure Act" undertaken by agencies to dismantle Nat'l Center for Atmospheric Research. open.substack.com/pub/balanced…

Alan Gerard (@wxmanms1.bsky.social) 2026-03-16T20:24:09.916302Z

Colorado will have its lowest statewide peak snowpack on record (8.4″ SWE), which has likely already peaked due to our incoming heatwave. Official records date to 1987.These paltry numbers below will likely plunge this week and next weekend.#COwx

Chris Bianchi (@bianchiweather.bsky.social) 2026-03-17T02:39:50.093Z

12/ Applied to #climate: the problem isn't too many people burning things, the system of fossil capital is built on profit that breaks natural cycles and externalises the costs onto the atmosphere and the poor. Commoner's laws ask where does the carbon go, and who pays.

Dr. Aaron Thierry (@thierryaaron.bsky.social) 2026-03-17T08:06:54.952Z

Insects are the front line victims of invasive species. It's not just #habitat destruction, #climate change, and #pollution that are the issues.52 studies in 6 continents show that the number of terrestrial #insect species is reduced by 31% on average.www.futura-sciences.com/en/bees-ants…

Vita Bee Health (@vitabeehealth.bsky.social) 2026-03-16T12:15:03.163Z

We enter now forced variability…"Climate change clearly is overtaking some of the other drivers at times,"#climate

(@umsonst.bsky.social) 2026-03-17T10:15:21.380Z

Why don’t people talk to each other about climate change? Because they think other people don't care! And that creates a "spiral of silence." Insidious, right?!Don't forget @katharinehayhoe.com's TED Talk for helping thinking about how to bring up climate change: buff.ly/4yM5L50

Covering Climate Now (@coveringclimatenow.org) 2026-03-17T12:31:14.451Z

US Blizzards, Polar Vortex, Heat Domes, Atmospheric Rivers – Weather Weirding, Weather Wilding and Weather Whiplashing…https://youtu.be/hKIM1RRuH8o?si=ukUdkSJ5S1vElxsQ #weather #weatherphotography #forecasting #meteorology #climate #Arctic #poles #climatechange

Paul Beckwith (@paulhbeckwith.bsky.social) 2026-03-16T23:22:26.045Z

🎥We need to take #ClimateAction by choosing #climate resilient development pathways (2)Learn more📖 www.ipcc.ch/report/ar6/w…PL RP Thank you!🩷💚💙graph from: ' #ClimateChange 2022 – Impacts, Adaptation and Vulnerability' @ipcc.bsky.social #EndFossilFuels #SaveOurPlanet #SaveTheEarth #Klima

My Zero Carbon #ClimateAction (@myzerocarbon.org) 2026-03-16T13:16:49.928Z

This week’s heat from the West Coast to the Plains will set hundreds of daily records—many by several degrees. Some areas may even set March records, with temperatures more typical of June.Learn how to stay safe: weather.gov/heat

National Weather Service (@nws.noaa.gov) 2026-03-17T18:48:59.412Z

Global renewable energy capacity tipped to double by 2031www.businessgreen.com/news/4526890…

Dr Paul Dorfman (@drpauldorfman.bsky.social) 2026-03-17T20:11:07.161Z

Balcony solar approvals put on fast-track, as UK races to bolster energy independence reneweconomy.com.au/balcony-sola…

Dr Paul Dorfman (@drpauldorfman.bsky.social) 2026-03-17T10:00:35.666Z

"Claims that drilling in the North Sea will significantly save households money are “sheer fantasy”, experts have warned as analysis showed renewables could cut bills by hundreds of pounds." #Scotlandwww.thenational.scot/news/2593960…

Dr Paul Dorfman (@drpauldorfman.bsky.social) 2026-03-17T09:58:57.033Z

Electricity prices from new #nuclear plants will be sky high with more delays to completion while jobs don’t materialize.beyondnuclearinternational.org/2026/03/15/d… via @BeyondNuclear

Dr Paul Dorfman (@drpauldorfman.bsky.social) 2026-03-17T09:47:48.078Z

For your consideration: Crowd funding for "The Sky is the Limit (NCAR–A documentary about a crown jewel of American science, the National Center for Atmospheric Research (NCAR) and the peril it faces."

Daniel Swain (@weatherwest.bsky.social) 2026-03-17T20:00:50.000Z

Proximity to #nuclear plants may affect cancer mortality risk www.healio.com/news/hematol…

Dr Paul Dorfman (@drpauldorfman.bsky.social) 2026-03-17T09:50:04.425Z

"I’m an ex-CIA officer. Trump has not dealt with Iran’s #nuclear threat. The regime’s stockpile of enriched uranium is still intact, deep underground in the Persian desert. And the risk of Islamic terrorist attacks against the West has surely risen."inews.co.uk/news/world/c…

Dr Paul Dorfman (@drpauldorfman.bsky.social) 2026-03-17T09:55:44.372Z

NIH grant awards are again lagging far behind historical averages, analysis shows www.statnews.com/2026/03/17/n… via @statnews.com #NIH #science #publichealth #DOGE

Ian Kremer (@wolverinebear.bsky.social) 2026-03-17T17:17:01.619Z

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