The possible shortage was first discussed in the summer of 2020 - over a year ago. It was supposed to be an issue bc of the potential need for shipping vaccines that needed colder temps than couriers could maintain. Demand also peaks when there is a natural disaster, such as parts of the country that are currently without power bc of Hurricane Ida. Carbon dioxide could be in short supply bc of the unbelievable number of craft breweries using it now (just kidding - I couldn't find any references for shortage of dry ice, carbon dioxide or ethanol.)