The most creative signs from New York's Global Climate Strike have one message in common: Time's running out

Greta Thunberg made her way to the march shortly after it began at 12:45 pm on Broadway.

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Then she brought out her hand-painted sign, which says "School strike for climate" in Swedish.

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Before the march began, protesters gathered in Foley Square, many of them carrying replicas of Thunberg's sign.

Most signs expressed a sense of urgency. Some demonstrators climbed onto lampposts to get their message out.

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Others gathered together in the grass, like the employees of Patagonia Sports in Manhattan.

Many of the demonstrators were young — some of them missed school to join the ranks.

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Some signs focused on the environmental impacts of climate change.

Others blamed politicians, like this sign featuring President Trump and Senate Majority Leader Mitch McConnell.

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Some protesters made signs to give away.

Others got creative with props.

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Around 12:30 pm, the marchers moved from Foley Square down Broadway, toward Battery Park.

This sign features the eponymous characters from the TV show "Rick and Morty."

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Some signs were simple and stark.

Others adapted meme culture for their message.

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Signs weren't the only ways marchers supported the cause — some wore T-shirts.

This sign pointed out the effects of climate change on birds while having a sense of humor.

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Some signs took humor to a new level.

But the overarching messages many demonstrators had was the importance of science — especially signs from student protesters.

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