The world is approaching the "point of no return" if politicians do not act to halt the climate crisis, the UN Secretary-General has warned. He was speaking ahead of the two-week long UN Climate Change Conference (COP25) in Madrid. The UN chief said the effects of the climate crisis was already being felt around the world, with dramatic consequences for humans and other species. • Subscribe to ITV News on YouTube: bit.ly/2lOHmNj • Get breaking news and more stories at www.itv.com/news Follow ITV News on Facebook: www.facebook.com/itvnews/ Follow ITV News on Twitter: twitter.com/itvnews Follow ITV News on Instagram: www.instagram.com/itvnews/