What can and do we do?
Here's a simple investment in solar/wind energy that paid off the first year, with a total investment of about $15:
Yes, we've changed almost every bulb in the house:
And for $35, we got a programmable thermostat, which is set at 68, with a bump to 70 for 2 hours in the morning for winter heat. For summer, we'll experiment to see what works well, but our usual was 80, with an occasional drop to 78.
(NB: I forgot to rotate the image and am too lazy to do it now and this is the temperature with no heat/air and some windows open today.)
There are other, bigger, things we've done and more we'll do, but I was thinking about how much energy we've saved as I was hanging out that load of laundry today.