Alexandria Ocasio-Cortez's voice cracks during speech on climate change – video

US congresswoman Alexandria Ocasio-Cortez gave a speech at a global mayors event on Friday, highlighting that the world's most advanced and richest economies are failing to take sufficient steps to combat climate change. Ocasio-Cortez's voice began to crack as she spoke about the future of any children she might have, stating that it was the current population's responsibility to steer the world away from environmental jeopardy