Key moments
In a stark reminder of the escalating impacts of climate change, recent studies reveal that human activities have significantly increased the frequency and severity of extreme weather events. Notably, the European heatwave of 2003, which resulted in approximately 70,000 deaths, serves as a chilling benchmark for the consequences of rising global temperatures. This alarming trend is underscored by the fact that 74% of extreme weather events analyzed have been made more likely or severe due to climate change, according to a comprehensive study by Carbon Brief.
The evidence is compelling: a staggering 85% of the extreme weather events included in the Carbon Brief map were influenced by human-caused climate change. This includes a wide array of phenomena, from heatwaves to heavy rainfall, all of which are becoming increasingly common as the planet warms. The global near-surface temperature in 2025 was recorded at 1.43 ± 0.13 °C above the pre-industrial average, marking a significant increase since the mid-19th century.
Further compounding these issues, the Earth’s energy imbalance has reached unprecedented levels, with ocean heat content also hitting a record high since monitoring began in 1960. The implications of these changes are dire, particularly for vulnerable regions. For instance, the Arctic sea-ice extent in 2025 was noted to be the lowest or second lowest on record since 1979, highlighting the rapid changes occurring in our climate system.
In Peru, the repercussions of climate change are manifesting in public health crises. The 2023 dengue outbreak has been linked to extreme rainfall from Cyclone Yaku, with estimates suggesting that 60% of the cases were attributable to this climatic event. By July 2023, Peru reported over 22,000 infections and 381 dengue-related deaths, illustrating the direct impact of climate change on human health.
Experts are increasingly sounding the alarm about these developments. Celeste Saulo, a prominent climatologist, stated, “Human activities are increasingly disrupting the natural equilibrium and we will live with these consequences for hundreds and thousands of years.” This sentiment echoes the urgency expressed by UN Secretary-General António Guterres, who warned, “Climate chaos is accelerating and delay is deadly.” Such statements reflect a growing consensus among scientists and policymakers that immediate action is required to mitigate these risks.
The study of extreme event attribution, which began in 2004 with research on the 2003 European heatwave, has evolved significantly. This field of study now allows scientists to pinpoint the role of climate change in specific weather events. Prof. Erin Mordecai remarked, “This is the first time scientists have been able to pinpoint the role of climate change and precisely measure the impact of a particular storm on dengue.” This advancement underscores the critical need for continued research and investment in climate science.
As the world grapples with the realities of climate change, the need for comprehensive strategies to address its effects has never been more urgent. The intersection of climate change and public health, as seen in the case of dengue in Peru, serves as a stark reminder of the interconnectedness of environmental and human systems. The path forward requires not only acknowledgment of these challenges but also decisive action to safeguard our planet and its inhabitants.
