The Microsoft founder hosted the Reconstructed Toilet Show. His stadium? For the marketing of futuristic toilets that do not need water or sewers.
"Today, rich countries have a sewer system where you import water, put human waste on it and go all the way to a processing plant," Gates told CNN.
"This requires the installation of many pipes. It is very expensive and will not happen in these newer, poorer cities."
According to the WHO, about 2.3 billion people still do not have basic sewerage facilities such as toilets or toilets.
Gates pointed out that the jar in his hand could contain "200 trillion rotaviruses … 20 billion shigella bacteria and 100,000 parasitic worm eggs."
The lack of clean hygiene comes at an impressive financial cost – the Gates Foundation estimates $ 223 billion a year in the form of higher health care costs and loss of productivity and wages.
Through the Gates Foundation's "Reinvent the Toilet Challenge", Bill and Melinda Gates donated $ 200 million to groups seeking to develop arid toilets for the last seven years.
To compete against the challenge, toilets had to cost less than 5 minutes a day to work without the need for external current or running water.
The foundation funded scientists to invent toilets that are self-contained – they take human waste, kill dangerous pathogens and convert the resulting material into products of potential commercial value such as clean water, electricity and fertilizer.
Gates chose to sell his stadium to a country that fought with clean drainage. In 2015, Chinese President Xi Jinping called for a national "toilet revolution". China's second-largest economy since 2010, China has made significant improvements in public hygiene, but many rural towns still do not have access to modern toilets.
Gates noted that the production of these toilets is in its early stages and that it will be at least a decade before refurbished toilets reach the masses in the poorest regions.
"The former are still quite expensive. It will take some time to get to the bottom of the market, "said Gates.
"But this is what we start and we have a lot of enthusiasm here that it can be built enough to cover Africa, something that will not happen without this discovery."