GENEVA —Ahead of next week's U.N. Climate Change Conference, or COP29, in Baku, Azerbaijan, health experts warn that the climate crisis is also a health crisis and say they must be addressed in tandem to save the planet for future generations.

"Human health and planetary health are intertwined," U.N. Secretary-General Antonio Guterres said in a statement. "Countries must take meaningful action to protect their people, boost resources, cut emissions, phase out fossil fuels and make peace with nature."

His call for action is buttressed by Tedros Adhanom Ghebreyesus, the WHO director-general, who calls COP29 "a crucial opportunity for global leaders to integrate health considerations into strategies for adapting to and mitigating climate change."

In preparation for the climate summit, the World Health Organization, in collaboration with more than 100 organizations and 300 experts, has developed a plan of action to protect the health of all people, "particularly the estimated 3.6 billion people who live in areas which are most susceptible to climate change."

"This document is a collective call from the health community to make sure that everybody understands the devastating impacts that climate change is having on our health" and to know what actions must be taken to prevent the worst from happening, Dr. Maria Neira, director of the WHO's Environment Department, told journalists at a briefing Thursday.

"We must move away from fossil fuel subsidies," she said, noting that "implementing fair carbon pricing and, of course, mobilizing the finance that is needed for climate and health action could save millions of lives every year."

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WHO data show the many ways in which climate change threatens human lives. Between 2030 and 2050, the WHO estimates that climate change will cause 250,000 additional deaths every year "from malnutrition, malaria, diarrhea and heat stress alone."

Without preventive action, the WHO warns, temperature and precipitation changes will spread death and illness from vector-borne diseases, which currently stand at more than 700,000 a year. It says heat-related deaths among people over age 65 have risen by 70% in two decades and are likely to rise further as the planet heats up.

"If we were to meet the Paris Agreement goals, we would save somewhere in the region of a million lives a year from reduced air pollution alone," said Dr. Diarmid Campbell-Lendrum, WHO team lead for climate change and health.

The 2016 Paris Agreement on climate change enjoins nations to keep greenhouse gas emissions from rising 1.5 degrees Celsius above preindustrial levels. The U.N. environment agency's annual emissions gap report, however, finds the world is headed in the wrong direction, with temperatures likely to rise to 3.1 degrees Celsius above preindustrial levels by the end of the century if preventive action is not taken.

"At the moment, the world is currently massively subsidizing fossil fuel consumption," Campbell-Lendrum said. "The costs of fossil fuel consumption are not only felt in the atmosphere, they are felt in people's lungs, old people's lungs, triggering heart attacks and so on, but also young people's lungs, impairing their development, giving them asthma, hampering their life chances.

"If we were to invest those resources more wisely, then we would have both a healthier planet and also much healthier populations," he said, adding that financing climate action "is a really good investment, in that you get a lot more back than you put in."

"We will be able to save almost 2 million lives a year and bring in $4 in benefits for every $1 that you invest in climate action," he said.

His colleague, Dr. Vanessa Kerry, WHO director-general special envoy for climate change health, agreed that the world cannot afford to ignore the warnings of the impact of climate change on health.

"Whether we choose to recognize it or not, climate change is here. Its impacts are accelerating, altering our ecosystems and communities and threatening our lives.

"Poor health destabilizes economies, widens inequalities and drives political unrest," she said. "When people cannot access essential needs for their families and lives, it leads to political and social instability. We must address health as a fundamental part of our climate response to prevent these cascading effects."

Kerry called on leaders gathering for COP29 to urgently "fast-track a just transition and increase funding for health systems" and for frontline health workers to protect the most vulnerable.

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