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Earlier Wednesday, Thunberg tweeted a grainy image showing the \"lights of Long Island and New York City,\" along with an excited, \"Land!!\"

Land!! The lights of Long Island and New York City ahead. pic.twitter.com/OtDyQOWtF5

— Greta Thunberg (@GretaThunberg) August 28, 2019

Thunberg documented her journey in regular tweets, including tales of both pleasant and bumpy conditions, dolphin sightings and life aboard the 60-foot boat.

\"PHOTO:
Johannes Eisele/AFP/Getty Images
PHOTO: The Malizia II, a zero-carbon yacht, with Swedish climate activist Greta Thunberg, 16, arrives in the US after a 15-day journey crossing the Atlantic in on Aug. 28, 2019, in New York.
>
\"PHOTO:
Johannes Eisele/AFP/Getty Images
PHOTO: Swedish climate activist Greta Thunberg, 16, arrives in the U.S. after a 15-day journey crossing the Atlantic in the Malizia II, a zero-carbon yacht, on Aug. 28, 2019, in New York.
>

\"At sea you really loose sense of time and you can't separate the days,\" she tweeted on the eighth day of her trip. \"You sleep, eat, look at the ocean.\"

Thunberg gained international attention with student protests that she started last August. Initially, she demonstrated on her own in front of the Swedish Parliament, and after images of her went viral, other students all around the world joined in on \"Fridays for Futures,\" striking from school to demand action from adults on climate change.

The Malizia II was \"fitted with solar panels and hydro generators,\" Thunberg wrote on Twitter, and \"also has an onboard lab to measure ocean surface CO2 and water temperature in cooperation with Max Planck institute.\"

\"PHOTO:
Mike Segar/Reuters
PHOTO: Swedish 16-year-old activist Greta Thunberg stands on the Malizia II racing yacht in New York Harbor as she nears the completion of her trans-Atlantic crossing in order to attend a United Nations summit on climate change in New York, Aug. 28, 2019.
>
\"PHOTO:
Mike Segar/Reuters
PHOTO: Swedish 16-year-old activist Greta Thunberg stands on the Malizia II racing yacht in New York Harbor as she nears the completion of her trans-Atlantic crossing in order to attend a United Nations summit on climate change in New York, Aug. 28, 2019.
>

The boat will be brought back to Europe after two crews from its sailing team fly across the Atlantic, The Associated Press reported. To offset those flying carbon emissions, a team member told the AP, they will be contributing to carbon-reducing projects.

\"During the past year, millions of young people have raised their voice to make world leaders wake up to the climate and ecological emergency,\" Thunberg said in a statement before starting her trip. \"Over the next months, the events in New York and Santiago de Chile [the U.N. Climate Change Conference] will show if they listened.\"

ABC News' Ester Wells contributed to this report.

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