Trump buildings are among the biggest polluters in NYC.

If Mayor de Blasio wants to challenge President Trump on climate change, he can start with the buildings bearing the billionaire’s name, an environmental group says.

A new report from ALIGN, a coalition of labor and environmental activists, found that big buildings owned by Trump and his son-in-law and close adviser Jared Kushner are among the least energy-efficient in the city.

“Those folks are the biggest polluters of our city — we need to take them on and actually make sure that they reduce their emissions,” Maritza Silva-Farrell, the executive director at ALIGN, said.

Heating, cooling and powering big buildings is responsible for 73% of the city’s global-warming-related emissions, according to city data. The city has voluntary programs aimed at reducing emissions, but Silva-Farrell is pushing for mandatory rules.

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“We think that it is really important to require these kinds of owners to reduce their emissions and create clean air for our communities,” she said. “We believe that’s the only way they will do it.”

Trump Tower uses more energy than 93% of the city’s large residential buildings, the report found, while the Mayfair, a hotel-to-condo conversion owned by the Trump Organization, uses more energy than 98% of large multifamily buildings in the city, the report says.

Buildings owned by President Trump do a lousy job at saving energy, according to an environmental report. Pictured is the Trump Tower on Fifth Ave.

(Theodore Parisienne/for New York Daily News)

The report ranked Trump International Hotel on Columbus Circle and Trump SoHo as using more energy than 70% and 79% of large hotels in the city, respectively.

The analysis is based on data from 2015, the most recent year available, that owners of buildings larger than 25,000 square feet must provide to the city, and takes into account the buildings’ relative size.

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The Trump Organization did not respond to a request for comment.

ALIGN also took a look at 666 Fifth Ave., owned by Kushner — who dropped $1.8 billion on it in 2007 — and found it uses more energy than 85% of large office buildings.

Kushner Cos. is hoping to tack another 40 stories onto the 41-floor structure and turn it into condos. “We look forward to developing a greener building on the current site of 666 Fifth Ave.,” a company spokesman said.

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ALIGN, an environmental group, wants Hizzoner to mandate that buildings reduce emissions.

(Marcus Santos)

The de Blasio administration is working to reduce emissions 80% by 2050 through voluntary programs.

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After an executive order from Trump dismantled many climate efforts, Silva-Farrell argued that the city should require such cuts.

The report cited the Empire State Building as an example of a successful retrofit. The iconic skyscraper, built in 1931, cut its energy use by nearly 40%.

A de Blasio spokesman said the administration would work with the City Council to ensure the goal is met. 

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