CNN: These lawmakers' districts are at highest risk of flooding. Here's where they stand on the climate crisis.

UN scientists were unequivocal in a landmark report published this summer: Human-caused climate change is intensifying extreme weather events. No region is spared from extreme weather, but America's coasts are overwhelmingly at risk to flooding caused by rising seas, stronger hurricanes and torrential rain.

As the climate crisis accelerates, extreme flooding threatens more critical infrastructure in the United States. A recent analysis found 25% of all critical infrastructure in the US -- things like hospitals, police stations and power plants -- is at risk of being rendered inoperable due to flooding.

But the threat is not distributed evenly, nor is it being approached everywhere with the urgency scientists implore.

Using new flood risk data from First Street Foundation, a nonprofit research group, CNN ranked the top 10 congressional districts where critical infrastructure is most at-risk to flooding. Six out of 10 of the House lawmakers that represent those districts voted against the recently signed bipartisan infrastructure law, which contains around $50 billion to help make particularly vulnerable communities more resilient to climate disasters like extreme flooding.

Those same six lawmakers also voted against President Joe Biden's Build Back Better plan, which has yet to pass the Senate and includes more than $500 billion in climate and green energy provisions. If passed, it would be the largest legislative climate investment in US history.

The votes were split along party lines, with Democrats voting in favor of the bills and Republicans voting against. Nine of the lawmakers represent low-lying coastal areas in Louisiana, Florida and Texas. One of the lawmakers represents a district in California at-risk to flooding from atmospheric rivers.

While Republicans have widely continued to cast doubt on the science of climate change, Democrats are more keen than ever to point to the connection between the climate crisis and deadly extreme weather, which costs taxpayers billions of dollars each year.

Here's how lawmakers who represent America's most at-risk districts voted on the two critical climate bills and where they stand on the climate crisis.

DORIS MATSUI – (D) California – District 6

District flood risk: 65% of the district's 124 critical facilities are at risk of failure due to flooding. The California 6th, which includes Sacramento, is susceptible to flooding along the American and Sacramento rivers.

Atmospheric rivers -- torrential storms that pull moisture over the West Coast from the Pacific Ocean -- pose significant risk to California. The storms, which scientists say are getting worse amid the climate crisis, can cause river flooding, flash flooding and mudslides. Matsui said that in November, her district got more rain in one day than it had received all year. "This type of quick, extreme rain can overload levees that were built for outdated conditions," she said.

Bipartisan infrastructure bill vote: Yes

Build Back Better Act vote: Yes

Where Matsui stands on the climate crisis: Matsui has long been outspoken about the need to combat climate change, and she told CNN she's working to modernize her district's levees so they can withstand future flooding. The 6th has also been hit hard by California's prolonged drought.

"As we move forward, we must understand that extreme drought conditions and extreme flood conditions are not separated, and in fact, can be largely intertwined," Matsui told CNN in a statement. "If we want to slow down the effects of climate change, such as larger and more frequent floods, we must reduce our emissions now."

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