There are 8 billion people on Earth, but soon we ll hit a decline we might never reverse, ABC News

The United Nations estimates that on November 15, the world will have a population of 8 billion people. Subscribe: Read more here: China remains the biggest country for now. But India will overtake it very soon. And Africa is growing faster than anywhere else. ABC Data Analyst Casey Briggs finds out what this will mean for the future. ABC News Indepth takes you deeper on the big stories, with longform journalism from Four Corners, Foreign Correspondent, Australian Story, Planet America and more, and explainers from ABC News Video Lab. Watch more ABC News content adfree on ABC iview: For more from ABC News, click here: Get breaking news and livestreams from our ABC News channel: Like ABC News on Facebook: Follow ABC News on Instagram: Follow ABC News on Twitter: Note: In most cases, our captions are autogenerated. , ABCNewsIndepth, ABCNewsAustralia