Extreme heat and marine heatwaves are causing widespread impacts, including record-breaking temperatures, health risks, and environmental damage. In the U.S., dozens of deaths were reported during Fourth of July celebrations due to triple-digit temperatures. Europe also experienced thousands of heat-related deaths in June. Marine heatwaves are damaging coral reefs and intensifying cyclones, while El Niño is expected to further elevate global temperatures and disrupt weather patterns. Vulnerable populations, infrastructure, and ecosystems are at heightened risk.