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Responding to the theme of the 2017 World Chemistry Congress, “Sustainability and Diversity in Chemistry,” Mr.
Wesley Laine, founder of Haiti-Philanthropy, presented “Chlorination of Haiti’s Drinking Water – A Sustainable Model for Developing Countries,” at the Congress on July 11, 2017. Laine, a 2017 graduate of Harvard Law School, described his work installing simple chlorinator devices that utilize “hockey puck” tablets of calcium hypochlorite to disinfect drinking water in the rural southeast of Haiti.
Using this method at Chauvet Cave revealed that the entrance was closed by a series of rockfalls occurring between 29 400 and 21 500 years ago, suggesting that the cave painting could not have been made after this time.
See also Ritual use of raptor claws by Neanderthals, 90 000 - 40 000 years ago, 20 000 year old stone huts from Kharaneh in Eastern Jordan, Neanderthals using red ochre at least 200 000 years ago and Rock Carving on the Gower Peninsula; Britain's oldest art?
Estimates of the age of these cave paintings, based upon their style of art and level of sophistication have suggested they were made between 10 000 and 22 000 years ago, but radiocarbon (¹⁴C) dating has suggested the site may be as old as 30 000 to 32 000.
This implies that early Europeans had reached a high level of artistic sophistication 10 000 years older than archaeologists had previously thought, something that has (unsurprisingly) been widely challenged.
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The risk is caused by chemical by-products called THMs which are produced when chlorine is added to water.