Climate Adaptation Could Cost $1.2 Trillion a Year by 2050, MGI Estimates

McKinsey Global Institute estimates climate protection could cost $1.2 trillion annually by 2050 under a 2°C warming scenario, with less than one-fifth of needed investment in India and Sub-Saharan Africa judged deployment-ready.

The estimate covers 20 measures to protect people and places from heat, wildfires, drought and flooding at standards common in developed economies. It combines annual operating expenses with capital costs spread over asset lifetimes, in 2020 dollars. The figures are rounded and describe a modeled scenario, not a forecast of actual spending.

MGI classifies about $460 billion in annual costs as deployment-ready and another $690 billion as facing demand or financing barriers. The latter figure represents the estimated cost of measures that may be difficult to deploy, not funds already raised and left unused. Against its 2020 climate baseline, MGI estimates annual spending on the same 20 measures at about $190 billion.

Affordability is the largest barrier, affecting measures with estimated annual costs of $440 billion. Another $210 billion depends on greater willingness or capacity to act: about $80 billion involves coordination and capacity, $70 billion incentive realignment and $60 billion demonstrating value. Financing constraints affect a further $40 billion.

The burden varies by region. At 2°C, adaptation costs could amount to 2% to 3% of gross domestic product in India and Sub-Saharan Africa, compared with 0.3% to 0.5% in higher-income regions. MGI assesses less than 20% of the investment needed in India and Sub-Saharan Africa as deployment-ready, versus more than half in higher-income regions. More than two-thirds of the deployment-ready amount could be in high-income places.

MGI estimates an average annual protection cost of about $130 per person, roughly half of average monthly household income in Bangladesh. Across the measures studied, estimated avoided-loss benefits average about three times costs under 2020 conditions and seven times costs at 2°C. Those modeled societal benefits do not necessarily produce revenue that can repay lenders.