On Friday, 15 March, hundreds of thousands of young people in about 100 countries boldly walked out of classrooms and schools. They took to the streets with placards to voice their support to "Fridays For Future", a worldwide strike and movement to protest inadequate action against climate change.

The origins of the demonstrations in India, the U.S., the U.K. and many other countries go all the way back to 16-year-old Greta Thunberg. The young Swedish activist — who was diagnosed with Asperger's syndrome four years ago — skipped classes almost weekly to stage strikes against climate inaction outside of the Swedish parliament building since August 2018. Her cause gained international traction and attention when she spoke at the UN Climate Talks in Poland in December and the World Economic Forum in Davos in January earlier this year. Recently, three Norwegian MPs nominated her as a candidate to receive this year's Nobel Peace Prize.

In Singapore, since public assemblies and processions are illegal without a permit from the authorities, youth turned to social media instead. The Singapore Youth for Climate Action distributed templates for posts and implemented the hashtags #climatestrike and #climateactionsg to coalesce a digital grassroots movement alongside the more confrontational global rallies. To date, there are about 3,000 posts by young Singaporeans as well as local personalities including Paul Foster.

The march doesn't end on 15 March, though. According to a press release by the U.S. Youth Climate Strike, there's more to come. "Youth leaders all around the world are currently planning another global climate strike during May 2019," it declared. "Expect more after that."

From witty wordplay to downright amusing, we've compiled some of the best placards from the strikes around the world below.