Lancet Countdown Calls Climate a Health Emergency

The Lancet Countdown just dropped its tenth annual report, and the headline is blunt: the health damage from climate change is speeding up, not slowing down. The authors want climate change formally treated as a global health emergency, and the numbers behind that call are hard to scroll past.

Faster harm since Paris

The 2026 Lancet Countdown finds that many health risks grew faster in the decade since the Paris Agreement (2016 to 2025) than in the decade before it (2006 to 2015). That is the opposite of what a world "taking action" would hope to see.

According to Phys.org, heat was linked to an average of 540,800 estimated deaths per year between 2016 and 2023. Of those, 68 percent were caused by climate change, up from 55 percent in the earlier decade.

The report also attributes heat deaths to human-caused climate change for the first time as a dedicated indicator. In plain terms, researchers can now say how many of those deaths would not have happened without the extra warming.

A record year for heat deaths

The single worst year in the data was 2023. The World Health Organization notes that heat was linked to a record 710,000 deaths worldwide that year, with more than seventy percent of that burden attributable to human-caused climate change.

That toll is bigger than the yearly deaths from malaria or HIV, according to the World Health Organization. The WHO adds that average annual heat deaths rose by nearly thirty-six percent in the years after Paris compared with the decade before.

Heat is not the only problem. The report points to worsening drought, more exposure to extreme rainfall and flooding, and large economic losses tied to heat exposure, which hit workers outdoors the hardest.

Canada's smoke problem

Closer to home, the Canadian angle is stark. According to CBC News, deaths associated with wildfire smoke in Canada are up about two hundred seventy-five percent since the early 2000s.

CBC reports that roughly four thousand deaths a year were linked to wildfire smoke between 2021 and 2025, compared with about one thousand fifty annually from 2003 to 2012. If you remember orange skies over Toronto or Montreal, that is the human cost behind the aesthetic.

Advocates quoted by The Energy Mix are also pushing for a new climate and health adaptation fund to protect Canadians from extreme heat, wildfires and smoke.

What the numbers actually mean

It helps to translate the stats. Almost three million heat deaths between 2016 and 2023 are linked to climate change, according to reporting by ABC News Australia on the study. That is roughly the population of a major city, lost to temperatures that used to be rare.

Those figures are estimates built from temperature records, population data and health models, so they carry uncertainty. Still, the direction is consistent across every source covering the report, and the authors describe their findings as unambiguous. The takeaway is that the trend line is steep, and it is steeper than the decade before.

Older adults, outdoor workers, kids and people without air conditioning carry the biggest risk. That also means the fixes are often practical: cooling centres, shade, better building codes, smoke-ready schools and early warning systems that actually reach people on their phones.

Why the timing matters

The report lands just ahead of COP31, the next big UN climate summit, and the authors clearly want health ministers in the room. Their pitch is that health should shape climate policy and funding priorities, not trail behind them.

There is a bright spot. The report says clean energy investment, health system leadership, more health-protecting laws and growing scientific evidence have delivered real gains. Those gains, though, are not enough to offset how fast the harms are growing.

For Gen Z, this is less abstract than it sounds. Hotter summers mean unsafe campus dorms, cancelled outdoor shifts, worse sleep and smoky air that makes asthma a group-chat topic. The long-term cost lands on the generation that will live through the next decades of data.

What to watch next

Watch whether governments respond at COP31 with money for health adaptation, and whether any country formally adopts the "global health emergency" language. Until then, the Lancet Countdown gives a yearly scoreboard, and this year the score is moving the wrong way. More on this beat lives in our climate coverage and our health section.