Checking my numbers for calculating CO2 savings for a smaller site design

Hey folks,

So, this GDPR thing has landed, and one side effect is that we're now
getting some waaaay smaller EU focussed sites.

It's also a chance to try quantifying the CO2 reduction from bandwidth
savings from these versions of sites, and USAToday's site turns out to be a
good case study, as their GDPR-friendly site is a tenth of the size of the
normal site, now that all the ad-tech scripts  are tripped out.

*How much CO2 does this actually save?*

I had a go at quantifying the savings, then converting these to CO2
emissions reductions.

My not-very-rigorous figures show something like 6.4 tonnes of CO2 saved
each month with the lighter weight design, based on USAToday's traffic -
which is pretty much *the annual footprint of a european saved each month*,
or a *flight from NYC to CHI each day*.

*Do these numbers  and the workings look plausible?*

I'd appreciate someone sanity checking these numbers - do they look
plausible to you?

https://blog.chrisadams.me.uk/2018/05/27/how-much-co2-can-you-save-when-you-remove-ad-tracking-from-news-sites/

The jupyter notebook showing my working are here:
https://github.com/productscience/planet-friendly-web/blob/master/binder/co2-savings-usatoday-gdpr.ipynb

Lemme know, as I'd like to refine this and share it with some WPO folk to
see if it makes sense to them.



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Chris Adams
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