Thousands of people young and old marched through Brussels to push world leaders to take bolder action to fight climate change at the U.N. climate summit in Glasgow starting this month, writes The Time.

Some 80 organizations took part in the protest, aiming for the biggest such event in the European Union’s capital since the start of the coronavirus crisis, which stopped the climate movement’s weekly marches in its tracks.

Cyclists, families with children, and white-haired demonstrators filled city streets, chanting slogans demanding climate justice and waving banners in English, French and Dutch. One carried a stuffed polar bear on her head.

Environmentalists worry that the 26th Climate Change Conference of the Parties, known as the COP26, in Glasgow starting Oct. 31 will produce policies that don’t do enough to slash carbon emissions and slow the warming of the planet.