You cannot stop a negative habit without knowing how much and how often you are doing it. Enter the financial "carrot": the online environmental calculator with a finance edge. Organizations like Xerox, RecycleBank and Creative Citizen are offering more than just a climate change reason to decrease consumption: money.
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Top three financial reasons to use an eco-calculator

Don’t make the “naughtiest†corporation list: green your paper
If the Victoria (dirty) Secret fiasco is anything of a hint of what’s to come for corporations like Sears from the new breed of powerhouse non-profits and their vigilant, eco-savvy members, Sears’ management is going to incur a few expenses over the next couple of months, including:
Advil extra-strength costs for 8am boardroom headaches: $65.

100 million trees harvested annually to create junk mail
A blog conversation: a tree-loving letter to a blogger
Get this: over 100 million trees are harvested annually to create junk mail and well, the 70 hours a year it is estimated we waste in dealing with junk mail is just not worth it.

7 deadly blog sins thou shall not commit on thy eco-blog

The “Thongs of Mass (Forest) Destruction†and other reasons to pay attention to onilne activism
Victoria’s Secret’s executives never expected this story to skyrocket from the underground level of blogs and hack basements to full page ad coverage of the likes of the New York Times. And, we didn’t even get to the part of Victoria’s Secret garnering a legal (and reputation) bill longer than Gisele Bundchen’s legs but there you have it: a case study that blogs have power and consumers are watching your every (un)green move.

Share a CO2 calculator with your blog readers: 3 ways to up your green blog's traffic
Tip #1 for increasing your green blog's traffic: Here's hidden gem in the green blogosphere that'll no doubt get your readers a little giddy if not incredibly keen to discover your green blog. Share the code of this CO2 calculator with your readers (who, I bet, are bloggers too) and win points. Oh and "get Stumbledupon". Read more traffic tips...
Google launches UK carbon footprint calculator
Google has launched a series of tools to help you estimate and reduce your carbon footprint -- if you live in the UK.
Lots of good info on tires
This page contains a lot of good information about tires in general and has a calculator that can tell you engine rpms at 60 mph for a given tire size.