Climate change isn't all downside for the largest U.S. companies. Many said they believe climate change can bolster demand for their products:

For one thing, more people will get sick. "As the climate changes, there will be expanded markets for products for tropical and weather related diseases including waterborne illness," wrote Merck & Co. The company didn't respond to a request for comment.

More disasters will make iPhones even more vital to people's lives, Apple predicted.

"As people begin to experience severe weather events with greater frequency, we expect an increasing need for confidence and preparedness in the arena of personal safety and the well-being of loved ones,'' the company wrote. Its mobile devices "can serve as a flashlight or a siren; they can provide first aid instructions; they can act as a radio; and they can be charged for many days via car batteries or even hand cranks.''

Living with climate change is also going to cost money, which some banks see as an opening. "Preparation for and response to climate-change induced natural disasters result in greater construction, conservation and other business activities," Wells Fargo and Co wrote, adding that it "has the opportunity to provide financing to support these efforts."

More disasters will mean increased sales for Home Depot, the company wrote. And as temperatures get higher, people are going to need more air conditioners. Home Depot predicted that its ceiling fans and other appliances will see "higher demand should temperatures increase over time."

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