Glossary for the Worldwide Transportation of Dangerous Goods and Hazardous ... - Malcolm A. Fox - Google Books

https://books.google.de/books?id=OWToCAAAQBAJ&pg=PA173#v=onepage

Worldwide, 500,000 shipments of materials which pose chemical, physical, or biological risks to human health, property, or the environment are made each day by air, rail, road, sea, and inland waterways totalling over 3. 6 bil 1 lion metric tons each year.…