human activity and the destruction of the planet

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Climate change and health

The impacts of climate change on people’s health around the world, including deaths due to heatwaves and the consequences of food insecurity, are at their “most worrying” since an international initiative began tracking them five years ago.

All 16 indicators of the health impacts of a warming world are worsening, the recent Lancet Countdown report shows. “Climate change-induced shocks are claiming lives, damaging health and disrupting livelihoods in all parts of the world right now. That means no continent or community remains untouched,” says Ian Hamilton at University College London.
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The Lancet, world's most credible medical journal whose trust has been hit  by HCQ scandal

Here is the Executive Summary from the Lancet Countdown on Health and Climate Change:

Executive summary

The Lancet Countdown is an international collaboration established to provide an independent, global monitoring system dedicated to tracking the emerging health profile of the changing climate.The 2020 report presents 43 indicators across five sections: climate change impacts, exposures, and vulnerabilities; adaptation, planning, and resilience for health; mitigation actions and health co-benefits; economics and finance; and public and political engagement. This report represents the findings and consensus of the 35 leading academic institutions and UN agencies that make up The Lancet Countdown, and draws on the expertise of climate scientists, geographers, engineers, experts in energy, food, and transport, economists, social, and political scientists, data scientists, public health professionals, and doctors.

 The emerging health profile of the changing climate

5 years ago, countries committed to limit global warming to “well below 2°C” as part of the landmark Paris Agreement. 5 years on, global carbon dioxide (CO2) emissions continue to rise steadily, with no convincing or sustained abatement, resulting in a rise in the global average temperature of 1·2°C. Indeed, the five hottest years on record have occurred since 2015.The changing climate has already produced considerable shifts in the underlying social and environmental determinants of health at the global level. Indicators in all domains of section 1 (climate change impacts, exposures, and vulnerabilities) are worsening. Concerning, and often accelerating, trends were seen for each of the human symptoms of climate change monitored, with the 2020 indicators presenting the most worrying outlook reported since The Lancet Countdown was first established.These effects are often unequal, disproportionately impacting populations who have contributed the least to the problem. This fact reveals a deeper question of justice, whereby climate change interacts with existing social and economic inequalities and exacerbates longstanding trends within and between countries. An examination of the causes of climate change revealed similar issues, and many carbon-intensive practices and policies lead to poor air quality, poor food quality, and poor housing quality, which disproportionately harm the health of disadvantaged populations.Vulnerable populations were exposed to an additional 475 million heatwave events globally in 2019, which was, in turn, reflected in excess morbidity and mortality (indicator 1.1.2). During the past 20 years, there has been a 53·7% increase in heat-related mortality in people older than 65 years, reaching a total of 296 000 deaths in 2018 (indicator 1.1.3). The high cost in terms of human lives and suffering is associated with effects on economic output, with 302 billion h of potential labour capacity lost in 2019 (indicator 1.1.4). India and Indonesia were among the worst affected countries, seeing losses of potential labour capacity equivalent to 4–6% of their annual gross domestic product (indicator 4.1.3). In Europe in 2018, the monetised cost of heat-related mortality was equivalent to 1·2% of regional gross national income, or the average income of 11 million European citizens (indicator 4.1.2).Turning to extremes of weather, advancements in climate science allow for greater accuracy and certainty in attribution; studies from 2015 to 2020 have shown the fingerprints of climate change in 76 floods, droughts, storms, and temperature anomalies (indicator 1.2.3). Furthermore, there was an increase in the number of days people were exposed to a very high or extremely high risk of wildfire between 2001–04 and 2016–19 in 114 countries (indicator 1.2.1). Correspondingly, 67% of global cities surveyed expected climate change to seriously compromise their public health assets and infrastructure (indicator 2.1.3).The changing climate has downstream effects, impacting broader environmental systems, which in turn harm human health. Global food security is threatened by rising temperatures and increases in the frequency of extreme events; global yield potential for major crops declined by 1·8–5·6% between 1981 and 2019 (indicator 1.4.1). The climate suitability for infectious disease transmission has been growing rapidly since the 1950s, with a 15·0% increase for dengue caused by Aedes albopictus in 2018, and regional increases for malaria and Vibrio bacteria (indicator 1.3.1). Projecting forward, based on current populations, between 145 million people and 565 million people face potential inundation from rising sea levels (indicator 1.5).Despite these clear and escalating signs, the global response to climate change has been muted and national efforts continue to fall short of the commitments made in the Paris Agreement. The carbon intensity of the global energy system has remained almost flat for 30 years, with global coal use increasing by 74% during this time (indicators 3.1.1 and 3.1.2). The reduction in global coal use that had been observed since 2013 has now reversed for the past 2 consecutive years: coal use rose by 1·7% from 2016 to 2018. The health burden is substantial—more than 1 million deaths occur every year as a result of air pollution from coal-fired power, and some 390 000 of these deaths were a result of particulate pollution in 2018 (indicator 3.3). The response in the food and agricultural sector has been similarly concerning. Emissions from livestock grew by 16% from 2000 to 2017, with 93% of emissions coming from ruminant animals (indicator 3.5.1). Likewise, increasingly unhealthy diets are becoming more common worldwide, with excess red meat consumption contributing to some 990 000 deaths in 2017 (indicator 3.5.2). 5 years on from when countries reached an agreement in Paris, a concerning number of indicators are showing an early, but sustained, reversal of previously positive trends identified in past reports (indicators 1.3.2, 3.1.2, and 4.2.3).

 A growing response from health professionals

Despite little economy-wide improvement, relative gains have been made in several key sectors: from 2010 to 2017, the average annual growth rate in renewable energy capacity was 21%, and low-carbon electricity was responsible for 28% of capacity in China in 2017 (indicator 3.1.3). However, the indicators presented in the 2020 report of The Lancet Countdown suggest that some of the most considerable progress was seen in the growing momentum of the health profession’s engagement with climate change globally. Doctors, nurses, and the broader profession have a central role in health system adaptation and mitigation, in understanding and maximising the health benefits of any intervention, and in communicating the need for an accelerated response.In the case of adaptation in national health systems, this change is underway. Impressively, health services in 86 countries are now connected with their equivalent meteorological services to assist in health adaptation planning (indicator 2.2). At least 51 countries have developed plans for national health adaptation, and global spending in health adaptation rose to 5·3% of all adaptation spending in 2018–19, reaching US$18·4 billion in 2019 (indicators 2.1.1 and 2.4).The health-care sector, which was responsible for 4·6% of global greenhouse gas emissions in 2017, is taking early but important steps to reduce its own emissions (indicator 3.6). In the UK, the National Health Service has declared an ambition to deliver a net-zero health service as soon as possible, building on a decade of impressive progress in reducing delivery of care emissions by 57% since 1990, and by 22% when considering the service’s supply chain and broader responsibilities. Elsewhere, the Western Australian Department of Health used its 2016 Public Health Act to conduct Australia’s first climate and health inquiry, and the German Federal Ministry of Health has established a dedicated department on health protection and sustainability responsible for climate-related matters. This progress is becoming more evenly distributed around the world, with 73% of countries making explicit references to health and wellbeing in their Nationally Determined Contributions under the Paris Agreement, and 100% of countries in the South-East Asia and Eastern Mediterranean regions doing so (indicator 5.4). Similarly, least-developed countries and small island developing states are providing increasing global leadership within the UN General Debate on the connections between health and climate change (indicator 5.4).Individual health professionals and their associations are also responding well, with health institutions committing to divest more than $42 billion worth of assets from fossil fuels (indicator 4.2.4). In academia, the publication of original research on health and climate changed has increased by a factor of eight from 2007 to 2019 (indicator 5.3).These shifts are being translated into the broader public discourse. From 2018 to 2019, the coverage of health and climate change in the media increased by 96% worldwide, outpacing the increased coverage of climate change overall, and reaching the highest observed point to date (indicator 5.1). Just as it did with advancements in sanitation and hygiene and with tobacco control, growing and sustained engagement from the health profession during the past 5 years is now beginning to fill a crucial gap in the global response to climate change.

 The next 5 years: a joint response to two public health crises

Dec 12, 2020, will mark the anniversary of the 2015 Paris Agreement, with countries set to update their national commitments and review these commitments every 5 years. These next 5 years will be pivotal. To reach the 1·5°C target and limit temperature rise to “well below 2°C”, the 56 gigatonnes of CO2 equivalent (GtCO2e) currently emitted annually will need to drop to 25 GtCO2e within only 10 years (by 2030). In effect, this decrease will require a 7·6% reduction every year, representing an increase in current levels of national government ambition of a factor of five. Without further intervention during the next 5 years, the reductions required to achieve this target increase to 15·4% every year, moving the 1·5°C target out of reach.The need for accelerated efforts to tackle climate change during the next 5 years will be contextualised by the impacts of, and the global response to, the COVID-19 pandemic. With the loss of life from the pandemic and from climate change measured in the hundreds of thousands, the potential economic costs measured in the trillions, and the broader consequences expected to continue for years to come, the measures taken to address both of these public health crises must be carefully examined and closely linked. Health professionals are well placed to act as a bridge between the two issues, and analogically considering the clinical approach to managing a patient with COVID-19 might be useful in understanding the ways in which these two public health crises should be jointly addressed.First, in an acute setting, a high priority is placed on rapidly diagnosing and comprehensively assessing the situation. Likewise, further work is required to understand the problem, including: which populations are vulnerable to both the pandemic and to climate change; how global and national economies have reacted and adapted, and the health and environmental consequences of these actions; and which aspects of these shifts should be retained to support longer term, sustainable development. Second, appropriate resuscitation and treatment options are reviewed and administered, with careful consideration of any potential side-effects, the goals of care, and the life-long health of the patient. Economic recovery packages that prioritise outdated forms of energy and transport that are fossil fuel intensive will have unintended side-effects, unnecessarily adding to the 7 million people that die every year from air pollution. Instead, investments in health imperatives, such as renewable energy and clean air, active travel infrastructure and physical activity, and resilient and climate-smart health care, will ultimately be more effective than these outdated methods.Finally, attention turns to secondary prevention and long-term recovery, seeking to minimise the permanent effects of the disease and prevent recurrence. Many of the steps taken to prepare for unexpected shocks, such as a pandemic, are similar to those required to adapt to the extremes of weather and new threats expected from climate change. These steps include the need to identify vulnerable populations, assess the capacity of public health systems, develop and invest in preparedness measures, and emphasise community resilience and equity. Indeed, without considering the current and future impacts of climate change, efforts to prepare for future pandemics are likely to be undermined.At every step and in both cases, acting with a level of urgency proportionate to the scale of the threat, adhering to the best available science, and practising clear and consistent communications, are paramount. The consequences of the pandemic will contextualise the economic, social, and environmental policies of governments during the next 5 years, a period that is crucial in determining whether temperatures will remain “well below 2°C”. Unless the global COVID-19 recovery is aligned with the response to climate change, the world will fail to meet the target laid out in the Paris Agreement, damaging public health in the short term and long term.

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2018 Lancet Report on Health and Climate Change

This is a second report, published in the Lancet; the first, published in 2015, was summarised in Chapter 1 (page 26) of my book.

This new report concentrates on predicting how climate extremes may impact on human health; for example, heat waves, changes in water (brackish) due to sea level rise, causing increases in disease-bearing insects, such as mosquitos, drought, reduced crop yields, causing malnutrition, a waning workforce. as outdoor workers cannot work for long hours in hot and humid conditions.  A great concern is about the effects of heat waves on the elderly (65 years+) and whether there will be a ‘systemic failure’ of hospitals in coping with adverse weather conditions.

The full report may be found at:

and an excellent summary from Carbon Brief at:

The following image gives a summary of the issues and is adapted from a diagram issued by the Yampa Valley Sustainability Council:

health and climate change

A youtube video summarising the Lancet report is at:

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The Effects of Climate Change on Human Health

In Chapter 1 of my book (Our beautiful world in harmony), I provide information on how climate change is affecting human health.  This is mainly taken from a 43-page report, ‘A Human Health Perspective on Climate Change’, written by Prof. Anthony Costello and others in 2010 . A full citation of the source can be found as reference 12 in the list of references given on this website.

Now, a new multi-author report, published in the Lancet, gives further supporting evidence.   It is entitled The Lancet Countdown of Health and Climate Change: from 25 years of inaction to a global transformation on public health.

Click to access PIIS0140-6736(17)32464-9.pdf

The Lancet Countdown tracks progress on health and climate change and provides an independent assessment of the health effects of climate change, the implementation of the Paris Agreement,1 and the health implications of these actions. It follows on from the work of the 2015 Lancet Commission on Health and Climate Change, which concluded that anthropogenic climate change threatens to undermine the past 50 years of gains in public health, and conversely, that a comprehensive response to climate change could be “the greatest global health opportunity of the 21st century”.

This article is available free of charge.

Some of its findings:

  1. Health Effects of Heat Waves

Statistical evidence is provided to show that 125 million more vulnerable people over the age of 65 years were exposed to heatwaves in 2016 compared with 2000.

2. Labour Capacity and Heat stress

“Extreme heat causes heat stress and heat stroke, exacerbations of pre-existing heart failure and kidney disease.”

Global labour capacity of rural labourers, such as farmers, has fallen by 5·3% from 2000 to 2016 due to rising temperatures and the inability to work when it’s too hot.

3. Infectious Diseases

Due to changing climatic conditions in countries where dengue is endemic, the capacity for one of the main mosquitoes (Aedes aegpyti) to transmit dengue fever has increased globally since 1950 by 9·5%.
4. Air Pollution and Public Health

Poor air quality impacts health by increasing rates of stroke, heart disease, lung cancer, and chronic and acute respiratory diseases.

Air pollution from a range of sources contributed to over 1·9 million premature deaths across southeast Asia in 2015.  A graphic in the report provides the numbers of deaths in 21 South East Asian countries, caused by particular polluting sources.


A particularly severe heatwave in the summer of 2003 resulted in more than 70 000 excess deaths across Western Europe. Health systems were unprepared and quickly overwhelmed.

Proven interventions will help prevent loss of life in the future:

  •   Developing clear heatwave and climate change management strategies and establishing early warning systems.
  •  Mapping vulnerable populations and providing cool-down zones.
  •  Simple engineering solutions, such as ensuring adequate ventilation for hospitals and nursing homes.


Coal is the largest contributor to greenhouse gas emissions of all fossil fuels, causing severe air pollution and affecting human health. While coal use increased globally since 1990, it appears to have peaked in 2013 and is now declining.  A graphic shows this levelling off but also demonstrates that China is still by far the highest user of coal to supply energy.

A growing number of countries have committed to ensuring coal is completely phased out over the next decade:


Divestment from fossil fuels

Research on health and climate change
“Science is critical to increasing public and political understanding of the links between climate change and health.
Since 2007, the number of scientific papers on health and climate change has more than trebled.