Careplane, a web browser plug-in, calculates emissions as you search supported travel sites such as Kayak and Orbitz, allowing for quick carbon comparison shopping.

BBC: How big is your carbon footprint?

ShopDAQ is a really cool price comparison plug-in that works for most Web browser, which displays in real-time other retail sites where you could find the same product, cheaper!

FORBES: Launch Festival Celebrates Startups, Innovation, but No "Booth Babe"