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WASHINGTON — New York City will be full of planet-saving pomp this coming week, but short on action to rescue the world.

More than 120 world leaders convene Tuesday for a UN summit aimed at galvanizing political will for a new global climate treaty by the end of 2015.

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Environmentalists will take to the streets Sunday in what is being billed as the largest march ever on global warming. Celebrities, CEOs and climatologists will appear at a string of events as part of New York’s annual climate week. “Titanic” star Leonardo DiCaprio will talk about what causes rising seas.

The hope is to recapture the momentum lost after the disappointing 2009 climate summit in Copenhagen, when world leaders left without a binding treaty.

The one-day UN summit, while not part of the formal negotiation process, is the pinnacle of the 7-year-old tenure of Secretary-General Ban Ki-moon, who has made fighting climate change his rallying cry and traveled the globe to personally invite world leaders to the gathering. Saying he was “humbled by the overwhelming response,” Ban urged leaders to come with bold ideas.