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WASHINGTON — Global warming is now affecting the United States more than ever, and the risks of future disasters — from flooding along the coasts to crop failures in the Midwest — could pose a profound threat to Americans’ well-being.

That’s the gist of Volume Two of the latest National Climate Assessment, a 1,656-page report issued on Friday that explores both the current and future impacts of climate change. The scientific report, which comes out every four years as mandated by Congress, was produced by 13 federal agencies and released by the Trump administration.

This year’s report contains many of the same findings cited in the previous National Climate Assessment, published in 2014. Temperatures are still going up, and the odds of dangers such as wildfires in the West continue to increase. But reflecting some of the impacts that have been felt across the country in the past four years, some of the report’s emphasis has changed.

Predicted impacts have materialized

More and more of the predicted impacts of global warming are now becoming a reality.

For instance, the 2014 assessment forecast that coastal cities would see more flooding in the coming years as sea levels rose. That’s no longer theoretical: Scientists have now documented a record number of “nuisance flooding” events during high tides in cities like Miami and Charleston, S.C.