Interesting little widget from CO2 stats that tracks how much CO2 is being emitted by your blog or website and then offsets it for free.
I am always interested in figuring out the CO2 impact of any activity I undertake, and if this is accurate it will be nice to know the impact of web browsing. But, their website doesn't really explain how they actually calculate the value, so I have no clue as to how accurate the value is. Looks like every time I do a refresh the value goes up by about .0001 lbs of CO2, but sometimes the value is .000109, sometimes .000099 and sometimes .000149. I emailed them to see how they figure the number, but haven't heard back yet.
Their business model seems to be to get advertisers to pay for the offseting of the CO2. Considering how little the co2 impact of a hit is, it should be fairly cheap to offset. Assuming 1/10,000 of a lb per click, that gets you to 20 mil clicks per ton of CO2. If the offsetting costs $10 a ton, then you can get 2 mil clicks per dollar. I will be curious to see how this all works out for them.
via Env Econ
Update: Got an email back from them.
The widget calculates the total emissions of a web site or blog by summing the emissions created by a web site's users' computers as they interact with servers. We first calculated the global average rate of carbon emissions due the to electricity consumption of a 300-W PC/server combination (17mg of CO2/sec). We then calculate for each member site or blog the summed emissions of all the visiting clients to that website, taking into account the amount of time they spend on the website.They are valuing it based on time spent on the blog rather than the number of pages served up. They are also taking into account the computer you are using as well as the web server.