Fax usage is growing every year though: https://finance.yahoo.com/news/fax-services-market-revenue-expected-121800944.html https://finance.yahoo.com/news/fax-se

Fax usage is growing every year though: https://finance.yahoo.com/news/fax-services-market-revenue-expected-121800944.html https://finance.yahoo.com/news/fax-services-market-revenue-e.... I'm not sure about the carbon footprint of fax, but I think it can't be worse than sending paper through slow mail.