Cattle gather in a field near a wind turbine in the Landes de Couesme wind farm near La Gacilly, western France, April 26, 2014.
The study, seen by Reuters News, found the companies' value would decline by an average of around 7% by 2030, equivalent to some $150 billion in investor losses, if they did not adopt new practices.
The report does not name specific companies so it is not taken as investment advice, a campaign representative said.
It is being published by Race to Zero, a U.N.-backed campaign to address climate change.
The report will be presented at Climate Week in New York, a series of events tied to the gathering of world leaders in the city.