Climate change could be even worse for Boston than previously thought


By Globe Staff 

The consequences of climate change on Boston are expected to be far more calamitous than previous studies have suggested, a new report commissioned by the city says.

Boston Climate Change

In the worst-case scenario, sea levels could rise more than 10 feet by the end of the century — nearly twice what was previously predicted — plunging about 30 percent of Boston under water. Temperatures in 2070 could exceed 90 degrees for 90 days a year, compared with an average of 11 days now.

And changes in precipitation could mean a 50 percent decline in annual snowfall, punctuated by more frequent heavy storms such as nor’easters.

The report, by scientists from the University of Massachusetts and other local universities, has raised concerns in City Hall just two weeks after Mayor Martin J. Walsh attended a climate summit in Beijing.

“We take climate change seriously, because we take the health and resilience of our city seriously,” Walsh said. “We will continue to focus on using the best data to inform decisions and understand future investments.”

The updated projections for Boston take into account new research that suggests the accelerating melt of the ice sheets covering Antarctica will have a disproportionate impact on cities along the East Coast.

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