Seas are expected to rise by 1 to 4 feet by 2100 but up to 12 feet is possible - if unlikely - in NJ.

The People's Climate March takes place on Saturday in Washington and 300 other locations.

The video above shows scenes from last year's event in New York City.

Scroll down for visualizations of the entire Jersey Shore.

By 2100, rising sea levels could envelop Keansburg Amusement Park, Asbury Park Convention Hall, downtown Brick and the entirety of the barrier islands, according to research and analysis by the National Oceanic and Atmospheric Administration and Climate Central.

New Jersey is among the states most vulnerable to rising sea levels, a consequence of climate change. Should the worst of it come to pass — an unlikely but possible 12-foot rise in sea levels — only four states would have more people impacted, according to Climate Central, a nonprofit that produces research and analysis on sea level change.

Under this doomsday scenario, the ocean would cover land where 710,000 people now live in the Garden State, putting $199 billion worth of property at risk.

New visualizations show worst-case scenario for sea levels by 2100.

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As the Earth's temperature warms, so do the seas. Heat-trapping greenhouse gases, such as carbon dioxide and methane, cause more land ice (glaciers and ice sheets) to melt and water to expand. Warmer water simply takes up more room than cooler water.

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Scientists say global warming will be the primary cause of future sea-level rise. Their greatest uncertainty is how quickly the massive West Antarctic ice sheet will melt.

See what would happen to the Jersey Shore in the gallery above.

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Contributing: Doyle Rice, USA TODAY

Russ Zimmer: 732-557-5748, razimmer@app.com