The climate crisis is still raging. A year ago, news headlines were dominated by the climate youth movement and a sense of urgency. But COVID-19 has displaced that interest and awareness. In fact, the causes of both crises share commonalities, and their effects are converging. The climate emergency and COVID-19, a zoonotic disease, are both borne of human activity that has led to environmental degradation. Neither the climate emergency nor a zoonotic pandemic were unexpected. Both have led to the preventable loss of lives through actions that are delayed, insufficient, or mistaken. However, aligning responses presents an opportunity to improve public health, create a sustainable economic future, and better protect the planet's remaining natural resources and biodiversity.

That health and climate change are interwoven is widely accepted, with extensive evidence of their interactions. For the past 5 years, the Lancet Countdown on Health and Climate Change has monitored and reported more than 40 global indicators that measure the impact of our changing climate on health. The newly published 2020 report includes novel indicators on heat-related mortality, migration and population displacement, urban green spaces, low-carbon diets, and the economic costs of labour capacity loss due to extreme heat. The breadth of the indicators has deepened scientific understanding of how climate affects health and puts stress on health systems.

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Curbing the drivers of climate change will help to suppress the emergence and re-emergence of zoonotic diseases that are made more likely by intensive farming, international trade of exotic animals, and increased human encroachment into wildlife habitats, which in turn increase the likelihood of contact between people and zoonotic disease. Increased international travel and urbanisation leading to higher population density encourage the rapid spread of zoonoses once they spill over into the human population. These factors also have an important role in climate change as environmental determinants of health.

Both COVID-19 and the climate crisis have exposed the fact that the poorest and most marginalised people in society, such as migrants and refugee populations, are always the most vulnerable to shocks. With regard to climate change, those most impacted by extremes have usually contributed the least to the root causes of the crisis. This year's Countdown report finds that no country is immune to avoidable loss of lives arising from widening inequalities, with every indicator in the report following a worsening trend.

Climate has slipped from the top of the global agenda because of political indifference and the need to deal with the immediacies of COVID-19. 5 years on from the Paris Agreement, seizing the opportunity to refocus interests on sustainability offers the cobenefits of protecting our future health, the environment, and our planetary systems. As governments embark on economic recovery plans in the wake of COVID-19, concerns for climate change and equity are rightly focused on a green recovery. A global rapid transition to clean energy sources is needed, ending the stranglehold of fossil fuels. Decisions being made now must tackle both crises together to ensure the most effective response to each.

(Adapted from

https://www.thelancet.com/journals/lancet/article/PIIS0140-

6736(20)32579-4/fulltext, published: December 02, 2020)