Students across the world took part in “climate strikes” to convey their feelings on enviromental issues pertaining to climate change.

In New Jersey, students took part in organized climate strikes in Montclair, Mahwah, Princeton, and Morristown.

Many were hoping that their voices would be heard and it would lead to changes being made to the regulations on greenhouse gas emissions.

The students who attended the rallies made signs urging political leaders to make changes to environmental policy.

Here are some of the notable signs from Friday’s climate strike that were spotted.

Michael Mancuso | NJ Advance Med

"There is no planet B" was one of the slogans used worldwide during the strike. Students from Princeton High School, Princeton University and the local community gather in Hinds Plaza next to the Princeton Public Library to participate in the worldwide "School Strike 4 Climate" demonstration.

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Patti Sapone | NJ Advance Media

Kathryn Close, 13, of Blairstown joins hundreds of people as they gather at Morristown City Hall to participate in the "Youth Climate Strikes" happening throughout the United States and other countries today. The student organized protest brought students and adults together to fight for climate change. March 15, 2019 (Patti Sapone | NJ Advance Media for NJ.com) Patti Sapone | NJ Advance Media

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They brought the T Rex pic.twitter.com/LPZYOeLSoR — Michael Sol Warren (@MSolDub) March 15, 2019

One group used a relic from the past in an attempt to highlight the importance of climate change

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Patti Sapone | NJ Advance Media

Using the Earth as ice cream, one sign maker got creative Morristown City Hall. (Patti Sapone | NJ Advance Media for NJ.com)

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One sign used an old joke to convey one of the messages

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Patti Sapone | NJ Advance Media

One of the signs was direct and to the point of what the person wanted to see occur.

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Michael Mancuso | NJ Advance Med

Some parents even brought their children to the strike with a sign in tow. James Tolland, 1, of Princeton lets his voice be heard in HInds Plaza next to the Princeton Public Library at the Princeton edition of the worldwide "School Strike 4 Climate" demonstration. James was with his mom, Jennifer Reinhart. Michael Mancuso | NJ Advance Media for NJ.com Michael Mancuso | NJ Advance Media for NJ.com

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Michael Mancuso | NJ Advance Med

Many of the signs created wanted to send the message there is only one Earth and everything should be done to protect it. This was spotted in Princeton.

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Patti Sapone | NJ Advance Media

This sign was at Morristown City Hall. (Patti Sapone | NJ Advance Media for NJ.com)

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Michael Mancuso | NJ Advance Med

This sign was in Princeton.

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Chris Franklin can be reached at cfranklin@njadvancemedia.com. Follow him on Twitter @cfranklinnews or on Facebook. Have a tip? Tell us.nj.com/tips