Trillions of dollars of economic activity along China’s east coast, including $974bn in Shanghai alone, are exposed to oceans rising as a result of climate change this century, according to Financial Times analysis of unpublished data.

When fine-grained gross domestic product and population data is mapped against projections of rising oceans for the year 2100, it shows that some of China’s most important commercial hubs could suffer from higher tides and annual flooding, unless drastic cuts are made to greenhouse gas emissions.

The analysis combines sea-level estimates by Climate Central, a US-based non-profit, with unpublished data from researchers in Finland that breaks down 2019 purchasing power parity GDP per capita and uses population density to work out grid-by-grid estimates of growth.