Here is a simple suggestion. Most people have door mats for people to dry their wet boots and shoes. This is an essential commodity but not always enough to keep the floors clean. Why not provide slippers for your family and guests? This will keep down any residual salt and mud from getting tracked in. Slippers are also a comforting change of pace in shifting from outside to inside.
How many light bulbs are equivalent to leaving your computer on at night? Even in sleep mode, one source says it's eqivalent to leaving ten ligthbulbs burning. http://www.realsimple.com/work-life/technology/shut-down-computer-00100000114946/index.html
There are things you can do to save energy, save water, and avoid toxic chemicals when you do laundry. Laundry actually is a major source of energy and water use. Check out these tips. http://www.realsimple.com/home-organizing/green-living/eco-friendly-laundry-tips-00000000055502/index.html
Here are some good tips for what to do as soon as you get home after a stressful day at work. These include such things as not going immediately to make dinner but taking a few minutes to relax—connect with nature--even the trees outside your window while drinking some relaxing green tea. Other good ideas here too. http://www.care2.com/greenliving/how-to-deal-with-post-work-stress-8-easy-ways.html