gig·a·ton (gĭg′ə-tŭn′, jĭg′-) n. A unit of explosive energy equal to that of one billion (109) tons of TNT. American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Miff...
• Solid waste disposal (and recycling) continues to pose challenges on a gigaton scale. A worrying proportion of the trash never makes it to the landfill or recycling centers, and end up dumped into the ocean. Every year, 50 million barrels of ...