Close We've made 9.1 billion tonnes of plastic since it was invented – here's where it ends up If the average household were to adopt a 1,000-gallon rain harvesting storage tank, the use of unnecessary potable water could be greatly reduced. Advertisement © 2017 HNGN, All rights reserved. Do not reproduce without permission. Advertisement 0 COMMENTS CLOSE COMMENT Get HNGN's Top Stories Newsletter Everyweek You have already subscribed. Thank you.