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Call for emergency action to limit global temperature increases, restore biodiversity, and protect health

Wealthy nations must do much more, much faster

Lukoye Atwoli1, Abdullah H. Baqui2, Thomas Benfield3, Raffaella Bosurgi4, Fiona Godlee5, Stephen Hancocks6, Richard Horton7, Laurie Laybourn-Langton8, Carlos Augusto Monteiro9, Ian Norman10, Kirsten Patrick11, Nigel Praities12, Marcel GM Olde Rikkert13, Eric J. Rubin14, Peush Sahni15, Richard Smith16, Nicholas J. Talley17, Sue Turale18, Damián Vázquez19

1) Editor in chief, East African Medical Journal, 2) Editor in chief, Journal of Health, Population and Nutrition; 3) Editor in chief, Danish Medical Journal, 4) Editor in chief, PLOS Medicine, 5) Editor in chief, The BMJ, 6) Editor in chief, British Dental Journal, 7) Editor in chief, The Lancet, 8) Senior adviser, UK Health Alliance on Climate Change; 9) Editor in chief, Revista de Saúde Pública, 10) Editor in chief, International Journal of Nursing Studies; 11) Interim editor in chief, CMAJ, 12) Executive editor, Pharmaceutical Journal, 13) Editor in chief, Dutch Journal of Medicine, 14) Editor in chief, NEJM, 15) Editor in chief, National Medical Journal of India, 16) Chair, UK Health Alliance on Climate Change, 17) Editor in chief, Medical Journal of Australia, 18) Editor in chief, International Nursing Review, 19) Editor in chief, Pan American Journal of Public Health.

Dan Med J 2021;68(10):A205091

The UN General Assembly in September 2021 will bring countries together at a critical time for marshalling collective action to tackle the global environmental crisis. They will meet again at the biodiversity summit in Kunming, China, and the climate conference (COP26) in Glasgow, UK. Ahead of these pivotal meetings, we—the editors of health journals worldwide—call for urgent action to keep average global temperature increases below 1.5°C, halt the destruction of nature, and protect health.

Health is already being harmed by global temperature increases and the destruction of the natural world, a state of affairs health professionals have been bringing attention to for decades [1]. The science is unequivocal; a global increase of 1.5°C above the pre-industrial average and the continued loss of biodiversity risk catastrophic harm to health that will be impossible to reverse [2,3]. Despite the world’s necessary preoccupation with covid-19, we cannot wait for the pandemic to pass to rapidly reduce emissions.

Reflecting the severity of the moment, this editorial appears in health journals across the world. We are united in recognising that only fundamental and equitable changes to societies will reverse our current trajectory.

The risks to health of increases above 1.5°C are now well established [2]. Indeed, no temperature rise is “safe.” In the past 20 years, heat related mortality among people aged over 65 has increased by more than 50% [4]. Higher temperatures have brought increased dehydration and renal function loss, dermatological malignancies, tropical infections, adverse mental health outcomes, pregnancy complications, allergies, and cardiovascular and pulmonary morbidity and mortality [5,6]. Harms disproportionately affect the most vulnerable, including among children, older populations, ethnic minorities, poorer communities, and those with underlying health problems [2,4].

Global heating is also contributing to the decline in global yield potential for major crops, falling by 1.8-5.6% since 1981; this, together with the effects of extreme weather and soil depletion, is hampering efforts to reduce undernutrition [4]. Thriving ecosystems are essential to human health, and the widespread destruction of nature, including habitats and species, is eroding water and food security and increasing the chance of pandemics [3,7,8].

The consequences of the environmental crisis fall disproportionately on those countries and communities that have contributed least to the problem and are least able to mitigate the harms. Yet no country, no matter how wealthy, can shield itself from these impacts. Allowing the consequences to fall disproportionately on the most vulnerable will breed more conflict, food insecurity, forced displacement, and zoonotic disease—with severe implications for all countries and communities. As with the covid-19 pandemic, we are globally as strong as our weakest member.

Rises above 1.5°C increase the chance of reaching tipping points in natural systems that could lock the world into an acutely unstable state. This would critically impair our ability to mitigate harms and to prevent catastrophic, runaway environmental change [9,10].


Encouragingly, many governments, financial institutions, and businesses are setting targets to reach net-zero emissions, including targets for 2030. The cost of renewable energy is dropping rapidly. Many countries are aiming to protect at least 30% of the world’s land and oceans by 2030 [11].

These promises are not enough. Targets are easy to set and hard to achieve. They are yet to be matched with credible short and longer term plans to accelerate cleaner technologies and transform societies. Emissions reduction plans do not adequately incorporate health considerations [12]. Concern is growing that temperature rises above 1.5°C are beginning to be seen as inevitable, or even acceptable, to powerful members of the global community [13]. Relatedly, current strategies for reducing emissions to net zero by the middle of the century implausibly assume that the world will acquire great capabilities to remove greenhouse gases from the atmosphere [14,15].

This insufficient action means that temperature increases are likely to be well in excess of 2°C, [16] a catastrophic outcome for health and environmental stability. Critically, the destruction of nature does not have parity of esteem with the climate element of the crisis, and every single global target to restore biodiversity loss by 2020 was missed [17]. This is an overall environmental crisis [18].

Health professionals are united with environmental scientists, businesses, and many others in rejecting that this outcome is inevitable. More can and must be done now—in Glasgow and Kunming—and in the immediate years that follow. We join health professionals worldwide who have already supported calls for rapid action [1,19].

Equity must be at the centre of the global response. Contributing a fair share to the global effort means that reduction commitments must account for the cumulative, historical contribution each country has made to emissions, as well as its current emissions and capacity to respond. Wealthier countries will have to cut emissions more quickly, making reductions by 2030 beyond those currently proposed [20,21] and reaching net-zero emissions before 2050. Similar targets and emergency action are needed for biodiversity loss and the wider destruction of the natural world.

To achieve these targets, governments must make fundamental changes to how our societies and economies are organised and how we live. The current strategy of encouraging markets to swap dirty for cleaner technologies is not enough. Governments must intervene to support the redesign of transport systems, cities, production and distribution of food, markets for financial investments, health systems, and much more. Global coordination is needed to ensure that the rush for cleaner technologies does not come at the cost of more environmental destruction and human exploitation.

Many governments met the threat of the covid-19 pandemic with unprecedented funding. The environmental crisis demands a similar emergency response. Huge investment will be needed, beyond what is being considered or delivered anywhere in the world. But such investments will produce huge positive health and economic outcomes. These include high quality jobs, reduced air pollution, increased physical activity, and improved housing and diet. Better air quality alone would realise health benefits that easily offset the global costs of emissions reductions [22].

These measures will also improve the social and economic determinants of health, the poor state of which may have made populations more vulnerable to the covid-19 pandemic [23]. But the changes cannot be achieved through a return to damaging austerity policies or the continuation of the large inequalities of wealth and power within and between countries.


In particular, countries that have disproportionately created the environmental crisis must do more to support low and middle income countries to build cleaner, healthier, and more resilient societies. High income countries must meet and go beyond their outstanding commitment to provide $100bn a year, making up for any shortfall in 2020 and increasing contributions to and beyond 2025. Funding must be equally split between mitigation and adaptation, including improving the resilience of health systems.

Financing should be through grants rather than loans, building local capabilities and truly empowering communities, and should come alongside forgiving large debts, which constrain the agency of so many low income countries. Additional funding must be marshalled to compensate for inevitable loss and damage caused by the consequences of the environmental crisis.

As health professionals, we must do all we can to aid the transition to a sustainable, fairer, resilient, and healthier world. Alongside acting to reduce the harm from the environmental crisis, we should proactively contribute to global prevention of further damage and action on the root causes of the crisis. We must hold global leaders to account and continue to educate others about the health risks of the crisis. We must join in the work to achieve environmentally sustainable health systems before 2040, recognising that this will mean changing clinical practice. Health institutions have already divested more than $42bn of assets from fossil fuels; others should join them [4].

The greatest threat to global public health is the continued failure of world leaders to keep the global temperature rise below 1.5°C and to restore nature. Urgent, society-wide changes must be made and will lead to a fairer and healthier world. We, as editors of health journals, call for governments and other leaders to act, marking 2021 as the year that the world finally changes course.

Correspondence: Laurie Laybourn-Langton, e-mail:
Competing interests: We have read and understood BMJ policy on declaration of interests and FG serves on the executive committee for the UK Health Alliance on Climate Change and is a Trustee of the Eden Project. RS is the chair of Patients Know Best, has stock in UnitedHealth Group, has done consultancy work for Oxford Pharmagenesis, and is chair of the Lancet Commission of the Value of Death. None further declared.
Provenance and peer review: Commissioned; not externally peer reviewed.
This editorial is being published simultaneously in many international journals. Please see the full list here:
This is an Open Access article distributed in accordance with the terms of the Creative Commons Attribution (CC BY 4.0) license, which permits others to distribute, remix, adapt and build upon this work, for commercial use, provided the original work is properly cited. See:

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Dan Med J 2021;68(10):A205091


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Kommentar til Klimaopråb fra internationale sundhedsfaglige tidsskrifter. Der skal handles nu. Temperaturen må ikke stige mere end 1,5 grader, ellers vil det få katastrofale konsekvenser for menneskers helbred.

Jeg tillader mig at anskue den skitserede problematik med den faglige analyserende indfaldsvinkel der bruges i den kliniske tilgang, når det gælder om til at stille en diagnose, for derefter at behandle sygdommen med den bedst mulige terapi. I den proces må der ofte indgå flere specialisters viden. Og fremfor alt må man være nøgtern, ærlig, og åben for nye synspunkter, og. ikke lade sig rive med af sine følelser, eller hvad der nu er politisk korrekt.
Når det gælder den aktuelle vurderingen af klimaforandringerne, og stategien til at modvirke en stigning af temperaturen, ,som finder sted fra FNs klimapanels side, er det svært at få øje på om et eneste af de ovennævnte etiske principper gør sig gældende.
Der blev fra starten kun anlagt een forklaringsmodel på den moderate temperaturstigning, der indsatte sidst i halvfjerdserne, en model som gik ude på at stigningen først og fremmest var forårsaget af tiltagende CO2 mængde i atmosfæren, på grund af brug af de fossile brændstoffer. Samtidigt blev det til starten på et skrækscenarie, ved at man ved hjælp af computermodeller fremskrev temperaturen til et niveau, der aldrig tidligere er set i menneskets historie. Forskere med tilgang til andre forklaringsmodeller, eller som så kritisk på hvordan fremskrivningerne var underlagr en manipulation, med henblik på at stille politikerne med de rette holdninger tilpas, blev og bliver fortsat udelukket for indflydelse.
Til gengæld har ingen kunnet undgå at måtte konstatere at temperaturen ikke stiger som klimapanelet har beregnet, og at stigningen tilmed er ved at flade ud, og hvor stigningen indtil nu ligger på o. 0,7 grader i løbet af de sidste årtier.
Koblingen imellem den forsat jævnt stigende mængde af CO2 i atmosfæren og den moderate temperaturstigning som flader ud holder derfor ikke. Men Ikke desto mindre vil politikerne gøre alt for at Danmark skal blive CO2 neutral senest i 2050. Med en nøgtern betragtning er der igangsat en fejlagtig kur over for en fejldiagnose af jordens klima.
Og som udtryk for at befolkningen igen og igen hører og læser om at det er i sidste øjeblik og der skal handles nu, må politikerne træde i karakter og med vanlig skelen til meningsmålingerne stadfæste en klimalov, så kuren ikke længere kan fraviges.
Naturligvis skulle flere specialisters viden inddrages, især de som besidder modeller, som modsat CO2 modellen, også kan forklare de klimaforandringer jorden har gennemgået, med svingninger imellem istider og så varmetider. Temperaturen har under varmetider ligget en del over de 1,5 grader, uden at der er beskrevet nogen form for elendigheder, når det gælder menneskers helbred, og hvor en øget temperatur og en øget CO2 i atmosfæren tilmed bibringer at vi får en mere grøn planet.

Johannes Kryger 32 Myter om klimaet du ikke skal hoppe på-læs hvorfor, hvis du tør.

Med venlig hilsen
Kurt Charleman speciallæge i psykiatri
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