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I generally tend to aim more towards the "consume less" end of things as a way to reduce environmental footprint. I enjoy wind turbines and solar power as much as the next guy, but on those hot, humid, still summer nights, we're going to be burning coal to run our air conditioners for the foreseeable future. (Or splitting atoms, but I've found that "nuclear power" is up there with religion and politics, so we'll skip that for now.) This sucks, but it's the way things are.
Linode does not directly purchase their electricity from a regulated utility, so unlike us normal folks, they're not in much of a position to purchase particular power production portfolios. This means that about all they can do is reduce consumption or buy carbon offsets. The former will have real measurable gains; the latter will give them a little logo they can put on their web site to make people feel good.
Datacenter equipment, from servers to air conditioners, is starting to become more efficient. There's a substantial economic impetus for this, of course: nearly every single watt of power that goes into a datacenter comes out of it through the cooling system. Consider the math I did earlier with 500 watts per host (including cooling)... multiply that by 40 hosts in a single 19" rack and you've got 20kW/rack, which is a very large number. Reducing this number is hard work, but the Intels and the Lieberts of the world are trying.
The improvements won't show up right away, of course. Datacenters are built for decades, and the construction of a datacenter (as with any other building) is pretty much an environmental disaster, so we don't go and bulldoze those suckers very often. However, take a look at NAC's new Parsippany datacenter, a 50,000 ft^2 facility currently under construction. Spec'd for 25kW/rack, with energy efficiency in mind and a 350kW solar array on the roof. It's a start.
As for what we can do, your best bet is to work towards cleaner power sources locally. Here at the HoopyCasa, we buy a local renewable electricity portfolio from an electricity cooperative. This ensures that there's at least a bit of a market for those sources in this region. I figure that will do a lot more than buying some offsets from some company with a schnazzy logo.
Even with that, though, it's all about conservation. Buy the most durable and energy-efficient appliances you can, use them smartly, and use them for a long time. -rt (still driving a 2002 Prius and printing on 100% recycled paper)
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