[TheSpiceIsLife]

Turn your water heater down a few degrees.

If I turn my water heater down I'll need to turn the hot tap on more when I have a shower, thereby using more not-so-heated water, resulting about the same amount of energy used.

Use your laptop's battery rather than leaving it plugged in all the time.

This one also doesn't work, because charging and discharging a battery results in energy lost as heat. Rechargeable batteries aren't 100% efficient.

And dimming your displays? I wouldn't worry about that, the handful of watt-hours I'd save a year doing that is grossly undone by forgetting something at the supermarket and driving back to get it.

Cycle or walk more, catch the bus / train / tram once a week, and as others have pointed out reduce consumption of animal products.