Everything has to change And it has to start today Greta THunberg Last Friday was a day of unprecedented world wide action with people of all ages taking to the streets in countries across the world demanding action to address climate change. Greta Thunberg, the Swedish youngster who travelled on a low-carbon sailboat from Europe to attend tomorrow’s UN Climate Action Summit in New York, has been one of the main driving forces behind the global rise in youth climate activism.