The reason for the baby steps is this...
Stage 1, buy a house worthy of doing this with... did that when I was 20
Stage 2, pay off said house... did that when I was 26
Stage 3, renovate heat and air to more effecient and more even heating and cooling (removed floor furnace and window airconditioner and went with central air)
Sage 4, pay off expensive central air system... did that when I was 29
Stage 5, New effecient windows and siding... installed, but not paid for yet
Stage 6, go solar... scheduled for in 5-7 years... doing research now and buying better/effecient appliances while paying for the latest remodel
I drive a 3 cylinder Geo Metro car which gets around 35 mpg for my every day car too. So I do what I can on gas consumption too. Oh, just a little tip, switch to florescent lighting if you have not done so. The savings over the old standard light bulbs is signifigant. I cut about 15% from my electricity use just by changing out every light bulb in my home. In the summer I also offset the airconditioner by using a swamp cooler. A swamp cooler is a water cooling type of fan. Plus it sounds like a waterfall and is relaxing to listen too.
This is my swamp cooler.