A petition calling on the Belgian government to strengthen its climate policy has already been signed by 100,000 people.
Meanwhile, thousands of Belgian students will again be skipping class for the sixth week in a row.
They're also demanding a better climate policy.
Kevin Ozebek has more from Brussels:
Hurricane Melissa hits Cuba hours after devastating Jamaica
Hurricane Melissa slammed into Cuba early on Wednesday, hours after causing devastation in neighbouring Jamaica as the strongest-ever storm on record to hit that Caribbean island nation.
Trump says Gaza ceasefire holds, Israel has right to hit back if attacked
US President Donald Trump said on Wednesday that a US-backed ceasefire in Gaza was not at risk after Israel launched airstrikes in the enclave, which killed 26 people in response to the killing of an Israeli soldier.
South Korea welcomes Trump with its highest award, a golden crown and ketchup
South Korea welcomed US President Donald Trump on Wednesday with a replica gold crown and awarded him with the "Grand Order of Mugunghwa", the country's highest decoration, the presidential office said.
Ex-Philippines president Duterte appeals ICC jurisdiction ruling
Rodrigo Duterte, the former president of the Philippines, has appealed last week's decision by the International Criminal Court to continue its case against him and is seeking his release, court documents showed on Wednesday.
Cyclone Montha lashes India's east coast; kills one
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