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:
Russian ballistic missiles kill 12 in Ukraine's Kyiv
Russian ballistic missiles have killed 12 people and injured more than 30 in Kyiv early on Thursday, authorities said, damaging buildings and severing power supply to some parts of the Ukrainian capital.
Prince Harry and Meghan to move back to Britain
Prince Harry and his wife Meghan plan to move back to Britain this month, six years after they stepped down from their royal duties and relocated to the US, a source close to the couple said.
North Korea fires suspected ballistic missile, Japanese authorities say
North Korea has fired a suspected ballistic missile towards the sea on Thursday, Japan's government and coastguard said.
Kenya tourist helicopter crash kills seven
Seven people, including five Americans, were killed on Wednesday when the tourist helicopter they were flying in crashed in Kenya's Samburu county.
US, South Korea to cut length, scope of military drills after Trump order
South Korea and the United States will cut short annual joint military drills to five days from 11 and scale back some field training, the allies said on Wednesday, after President Donald Trump ordered a substantial reduction in US participation.
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