"Yet, there is little guidance on how you can take action to control energy costs." (lines 5-7) - addition

"So why not treat energy costs in the same way?" (lines 13-14) - contrast

"This offers little incentive for saving energy since individuals never see the impact of their decisions, " (lines 33-34) - reason

"One of the first issues people confront . is whether they have executive support." (lines 37-39) - exemplification.

"And while there is a lot of talk about green datacenters", (lines 42-43) - cause