IT-centric orgs definitely care. In my second (post-college, full-time) job I got to see the effect of this directly as truck loads of old server equipment were replaced with about 1/10th the hardware. In their case, predominantly by making good use of virtualization so that applications could share hardware. They cut their power consumption by more than 90% by upgrading to newer machines as well (which were more efficient, while still being faster than the old ones).

This broad brush view that the IT industry doesn't care is absurd, they have to pay bills too and efficiency reduces those. They may not be motivated by environmental concerns, but the costs are very much obvious to them and they do address it with improved efficiencies where possible.