In New York, what is all the steam coming from under the sidewalks?

When one watches movies featuring New York, there appears to be steam rising up from many of the sidewalks. Where is this all coming from?

Answer #1

the subway maybe? do they have heat under there, cause if they do, that’s probably it

Answer #2

Hi Andy, If this is the case, why does this not happen in Britain? What is different?

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