One of the world's natural wonders is at its lowest level in 25 years as Zambia's President Edgar Lungu warns that climate changer doubters could contribute to losing waterfall. SUBSCRIBE to our YouTube channel for more videos: www.youtube.com/skynews Follow us on Twitter: twitter.com/skynews Like us on Facebook: www.facebook.com/skynews Follow us on Instagram: www.instagram.com/skynews For more content go to news.sky.com and download our apps: Apple: itunes.apple.com/gb/app/sky-news/id316391924?mt=8 Android play.google.com/store/apps/details?id=com.bskyb.skynews.android&hl=en_GB