The UK-based Carbon Disclosure Project (CDP) joined forces with 21 cities to implement the scheme, which some 1,300 companies have already signed up to.
The cities will gather emissions data for their municipal functions, such as their fire and police departments, government buildings and
waste services. They will also assess emissions from the city as a whole.
"If you don’t measure these emissions, you cannot manage them," Paul Dickinson, chief executive of the CDP, was quoted as saying.
The CDP, which represents 385 global institutional investors, says it has collected the largest corporate greenhouse-gas emissions database
in the world.
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