 Mukora iki ku kuba iyo urebye nta kintu kiri gukorwa? Twese dufite icyo gukora ariko hari abafite byinshi Greta wimyaka 16, yibukije ko kompanyi 100 ku isi ari zo zohereza 71 yibyuka bihumanya ikirere, ko ibihugu bikize cyane biri muri G20 byonyine byohereza mu kirere hafi 80 yibyo byuka byose. 