Updated Flood Risk Index maps how a changing climate will shape flood risk in the future

Published: Thursday, 21 July 2022 07:38

Marsh McLennan has released its updated Flood Risk Index 2.0, which shows how flood risks are expected to alter and develop as the climate changes.

Flooding is the most pervasive natural disaster, yet its costs are routinely underestimated. Climate change, economic and demographic trends, and a chronic shortfall in investment in resilience are combining to drive risk higher, says Marsh McLennan. 

The Flood Risk Index includes risk scores for 180 countries in present-day conditions and in 1.5 °C, 2°C and 3.5 °C warming scenarios. The Index shows that a 3.5 °C warming would lead to a dramatic increase in flood risk globally, and that even limiting temperature rise to 1.5 or 2°C would substantially worsen the threat of flooding.

According to the Index:

Given the propensity for large infrastructure projects to be situated near bodies of water, the Index now includes information about the global distribution of these critical assets. According to Marsh McLennan’s estimates, 23 percent of the world’s power generation capacity, 26 percent of international port outflows, and 18 percent of international airport seats are currently at risk of flooding. A 2°C warming would cause these percentages to rise to 41 percent, 52 percent, and 37 percent, respectively.

More details.