Youth stage global climate strike

Young activists gesture as they take part in a demonstration during a global day of action on climate change in Khayelitsha township near Cape Town, South Africa.

A demonstrator holds a sign as Fridays for Future activists protest calling for a "Global Day of Climate Action" in Berlin, Germany.

Swedish climate change activist Greta Thunberg holds a sign reading "School strike for climate" as she protests in front of the Swedish Parliament in Stockholm, Sweden.

A child wears plastic bottle waste provided by climate change and environmental activists as they protest marking a global climate action day under the theme ''#AfricaIsNotADumpster'' at the Uhuru Park's Freedom Corner in Nairobi, Kenya.

Protestors carry placards as they demonstrate as part of a global day of action on climate change outside parliament in Cape Town, South Africa.

A woman holds a sign as Fridays for Future activists protest calling for a "Global Day of Climate Action" in Hamburg, Germany.

Fridays for Future activists protest calling for a "Global Day of Climate Action" in Berlin, Germany.

A demonstrator holds a placard as Fridays for Future activists protest calling for a "Global Day of Climate Action" in Berlin, Germany.

A demonstrator holds a sign as Fridays for Future activists protest calling for a "Global Day of Climate Action" in Vienna, Austria.

Demonstrators hold a sign as Fridays for Future activists protest calling for a "Global Day of Climate Action" in Hamburg, Germany.