ISSG also manages and maintains GISD, a free, online public resource of authoritative information about IAS (see footnote 10). ... Unlike other pollution, they are not diluted in time; on the contrary, they expand in numbers, density, and geographic 1 a#39; http://www.issg.org. ... Washington, DC: Shearwater Books/Island. ... Web page: http://www.biodiv.org/doc/meetings/cop/cop-06/official/cop-06-20- en.pdf.