June 7, 2008 - Online discussions of sustainability zoomed more than 50 percent in the last year, according to a blog survey by Nielsen Online, an Internet market research firm. In the last quarter of 2006, "a couple of hundred thousand posts" were made about sustainability, she said. Not only does she use cloth bags for grocery shopping instead of plastic or paper bags that might end up in the landfill, she and her husband are limiting the size of their family.