epa07857637 Sixteen-year-old climate activist Greta Thunberg speaks at the Youth Climate Strike in Battery Park in New York, New York, USA, 20 September 2019. An estimated quarter of a million people marched in New York to protest government inaction on the climate crisis.  EPA/PETER FOLEY
Sixteen-year-old climate activist Greta Thunberg speaking at the global climate strike in New York. Peter Foley / EPA

Not all heroes today are muscle-bound and wear capes