As record-breaking heat becomes the new normal, researchers are sounding the alarm on a lesser-known casualty: kidney health. During extreme heat days in summer 2025, nearly 30% of kidney-related ER visits were attributable to high temperatures. Long-term data show that each 1°C rise in average temperature is linked to a 0.23 percentage point increase in chronic kidney disease (CKD) prevalence — with the hardest hits falling on lower-income and rural communities.

The concerning irony? Dialysis — the lifeline for millions with end-stage kidney disease — is itself an environmental burden. In-center hemodialysis generates up to 4,814 kg of CO₂ per patient annually, and dialysis units can use twice the water of an average U.S. household per day. Experts are pushing for "green dialysis" strategies, from renewable energy adoption to individualized care plans that reduce resource use without compromising patient outcomes.

By the Numbers:

• ~30% of kidney-related ER visits during extreme heat days were heat-attributable
• Each 1°C temperature rise → +0.23% CKD prevalence, +1.37 ESKD cases per 100,000
• In-center hemodialysis: 4,814 kg CO₂e per patient/year — the highest of all dialysis modalities
• 30% of clinical waste in the U.K. originates from dialysis units

Why it matters: Climate change and kidney disease are locked in a concerning feedback loop. Without systemic action — from patient education to federal policy — rising temperatures will drive more kidney disease, demanding more dialysis, which in turn accelerates environmental harm.