Overview
Heatwaves have become a pressing concern, doubling in frequency between 1986 and 2005. These extreme temperature events pose severe risks to vulnerable populations like older adults and infants. In 2020, over 60% of high-temperature days were attributed to anthropogenic climate change, leading to an 85% increase in heat-related deaths among people over 65 compared to the 1990-2000 period. This alarming trend significantly surpasses previous predictions based on historical temperature trends.
The impacts of climate change are far-reaching, extending beyond heatwaves. The global land area affected by extreme drought has expanded dramatically, from 18% in the 1950s to 47% from 2013 to 2022. This increase in drought-prone areas severely impacts water security, sanitation, and food production. In 2021, the rise in heatwaves and droughts was linked to increased food insecurity, affecting 127 million more people than the 1981-2010 average. Additionally, changing climatic conditions are worsening the spread of infectious diseases like dengue, malaria, and West Nile virus.
Economically, the repercussions are substantial. Between 2010-14 and 2018-22, losses from extreme weather events rose by 23%, amounting to $264 billion in 2022. Heat exposure has also resulted in significant global income losses, estimated at $863 billion, disproportionately impacting countries with lower and medium Human Development Index (HDI).
The strain on global health systems is mounting, with 27% of cities reporting concerns over being overwhelmed by climate impacts. Countries most vulnerable to these changes, especially those with limited resources, face significant adaptation challenges. This situation highlights the disparity in global responses to climate change and the need for more equitable solutions.
Looking to the future, the projections are dire. If temperatures continue to rise towards 2°C, heat-related deaths could increase by 370% by mid-century without significant adaptation efforts. The spread of life-threatening infectious diseases is also expected to intensify. However, these projections may not fully capture the extent of the impact, as they do not consider climate change's non-linear and cascading effects.
The trend in CO2 emissions and fossil fuel use is concerning. In 2022, energy-related CO2 emissions reached new heights, and investment in fossil fuels still outpaced renewable energy sources. This trend underlines the urgent need for a transformation in energy, transport, and food systems to mitigate risks and promote health benefits.
Despite these challenges, there are positive developments. Deaths from fossil-fuel-derived air pollution have decreased since 2005, renewable energy employment is at an all-time high, and global clean energy investment is rising. The health sector, a significant contributor to global GHG emissions, can lead the way in this transition.
COP28 presents an opportunity to accelerate action on climate change to protect health and well-being. It requires confronting the fossil fuel industry's interests and making substantial progress towards a sustainable, equitable future. The health community's role is critical in ensuring that health-promoting climate actions are prioritized in policy decisions, essential for securing a thriving future for all.
