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For example, the report details 13 airports that have runways that could be inundated by rising sea level. It mentions that thawing Alaskan ground means 50 percent less time to drill for oil. And overall it says up to $6.1 billion in repairs need to be made to Alaskan roads, pipelines, sewer systems, buildings and airports to keep up with global warming.

Sewer systems across America may overflow more, causing damages and fouling lakes and waterways because of climate change, the report said. The sewer overflows into Lake Michigan alone will more than double by the year 2100, the report said.

While warmer weather may help some crops, others will be hurt because of “weeds, diseases, insect pests and other climate change-induced stresses,” the report said. It said weeds like kudzu do better with warmer weather and are far more likely to spread north.

“Several populations - including children, the elderly, the sick, the poor, tribes and other indigenous people - are especially vulnerable to one or more aspects of climate change,” the report said.

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Online:

The National Climate Assessment: http://ncadac.globalchange.gov.

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Seth Borenstein can be followed at http://twitter.com/borenbears