From Jakarta to New York, children walk the streets to demand action on climate change.Vanessa Nakate, a 22-year-old from Uganda, says she is worried about the impact of climate change as she sells solar-powered batteries.Oladosu Adenike the 25-year-old protester in Nigeria says she can see the effects of global warming in her country and that climate change is affecting floods, droughts and changing food prices.They say tackling climate is a matter of global justice and more effective than a purely environmental message as Harriet Thew says.They made headlines after Greta Thunberg sailed to New York by a solar-powered boat.It has become a global movement and has been joined by 1.6 million children in 125 countries.These concerns are related to natural disasters as a result of climate change such as forest fires.Their message is clear.