Rising seas threat

# What happened Global sea level rose by almost six millimetres in 2024—the largest annual increase on record. That single figure is part of a longer upward trend: the pace of sea‑level rise has accelerated in recent decades. Measured globally in millimetres, the change eventually shows up locally as flooded settlements, retreating shorelines and saltwater moving inland.

# Why it matters for Pakistan Pakistan's coastline exceeds 1,000 kilometres along Sindh and Balochistan. It includes Karachi, a densely populated metropolis, and the ecologically sensitive Indus Delta. Low‑lying communities along the Sindh coast are already experiencing the combined effects of:

• rising sea levels
• coastal erosion
• storm surges
• saltwater intrusion

What many still talk about as a future risk is already unfolding for delta communities. Even modest average rises multiply local impacts where the coast is low, heavily populated, or ecologically fragile.

# What authorities should change now Sea‑level projections must inform decisions being made today. Concrete steps include:

• factor projected sea levels into infrastructure planning, land‑use and emergency preparedness.

These are planning choices that reduce future displacement, economic loss and the need for expensive retrofits.

# Nature‑based defences and limits of planting drives Natural barriers such as mangrove forests provide a buffer against waves and storm surges. Pakistan has increased mangrove cover through plantation efforts. However, plantations alone are insufficient. Effective natural‑defence strategies require:

• integrating mangrove work with wider coastal planning rather than treating it as a standalone fix.

# The global context Assembly adopted a unanimous declaration calling for stronger global action on sea‑level rise. Small island states face the clearest existential threat, with territories at risk of submergence. But continental coastlines—including Pakistan's—face serious and growing economic, ecological and social costs that already demand policy responses.

# Bottom line Measured increases in global sea level are translating into real harm on Pakistan's coast today. Authorities should stop treating sea‑level rise as a distant problem: use projections in current planning, designate and protect high‑risk zones, and combine nature‑based measures like mangroves with broader coastal management to reduce immediate and long‑term risks.