From shipyard to industrial park — and now farm.

The Brooklyn Navy Yard is taking “going green” to heart, opening a 45,000-square-foot rooftop farm to supply local restaurants, shops and foodies with fresh, organic produce.

Brooklyn Grange — which, oddly, is based in Long Island City, Queens — is expanding the operations of its first-ever Big Apple rooftop produce garden by opening a new open-air farm atop a Navy Yard building near Flushing Avenue and Cumberland Street.

The site was once used for manufacturing by the military but is now part of the city-run industrial park.

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