How do the melting of the Arctic ice and glaciers of the Antarctic differently affect the weather patterns and human activities on the Earth? Explain.

The Arctic is a frozen ocean surrounded by continents, whereas Antarctica is a continent holding about 90 per cent of the world’s land ice. Their melting therefore acts on weather and human activity through different pathways.

Melting of Arctic ice

• Sea-ice loss lowers albedo, driving Arctic amplification — the region has warmed nearly four times faster than the global average.
• A reduced pole–equator temperature gradient weakens and meanders the polar jet stream, producing cold outbreaks, heatwaves and blocking events across mid-latitude North America and Eurasia.
• Polar research studies link declining Barents–Kara sea ice to variability in Indian monsoon rainfall; permafrost thaw releases methane, reinforcing warming.
• Human activities: the opening Northern Sea Route shortens Europe–Asia shipping; access improves to hydrocarbons (USGS estimates roughly 13 per cent of undiscovered oil and 30 per cent of gas) and new fisheries; Inuit livelihoods and permafrost infrastructure are disrupted; strategic competition intensifies — India too issued an Arctic Policy in 2022.
• Because sea ice floats, its melt adds little directly to sea level.

Melting of Antarctic glaciers

• Land-ice loss raises global sea level directly; the destabilising Thwaites Glacier alone stores over half a metre of sea-level equivalent.
• Cold freshwater influx weakens the thermohaline circulation and disturbs the Southern Ocean’s role as the planet’s largest heat and carbon sink, altering global rainfall patterns.
• Human activities: rising seas threaten coastal megacities and small island states, push saline water into deltas such as the Sundarbans, and amplify storm surges; krill-based fisheries shift poleward. As the continent is uninhabited, its impacts are global rather than local.

Arctic melting thus reshapes northern-hemisphere weather and opens contested economic frontiers, while Antarctic melting operates through sea level and ocean circulation with planetary consequences — together making deep emission cuts, as the IPCC urges, non-negotiable.