Two entirely unrelated posts caught my attention today. Tom Raftery asks whether SaaS saves greenhouse gases. Quick as a flash, Chris Yeh from PBWiki does some back of fag packet calculations and comes up with the startling conclusion:

That means PBwiki could be saving the world up to 585,000 tons of carbon dioxide per year, or the equivalent of driving an SUV around the world 50,000 times!

Tom is sceptical of the assertion, qualifying it to say:

Now, obviously not all 500,000 hosted PBWiki’s are replacing an individual server but say 100 PBWikis replaces one server, or 1,000. That’s still somewhere between 600 and 6,000 tons of CO2 PBWiki are saving the planet per annum.

That’s still pretty impressive but like Tom, I’d like to see harder numbers. Elsewhere, Simon Wardley, whose thinking is generally both out of the box yet spot on talks about finding new ways to shed extra pounds.

Anyway for reasons of vanity I’ve decided to do something about my additional mass. Having caused environmental damage gaining it, I’d rather minimise the environmental cost of removing it. Whilst one obvious option is to spend time down the gym, I was wondering whether anyone has done a study of how much additional co2 such pointless exercise causes. I say pointless because there are usually no additional benefits to gym exercise other than the exercise itself.

What I’m looking for is exercise with some form of point, such as an allotment or forestry work or volunteer gardening. However, I’d still be interested to know what each kilo of my additional mass means in unnecessary and unsociable environmental damage caused.

That seems like an eminently good way to look at the problem of exercise that yields a net-net positive outcome. Until I read Simon’s post, I was thinking about investing in a WiiFit. But then I’d also have to calculate the amount of energy I’d be consuming by running the Wii. Ugh!

It seems that sometimes, you just can’t win. Unless of course you’re prepared to consider Simon’s option.