It's better than doing nothing.

You should try to do more little things though.

Like maybe replace a couple of your lightbulbs with energy saving ones.
Make sure you turn off the lights when you leave a room or don't use the lights if you don't need them.
Walk or bike to more places if you can.
When you take a shower, don't leave the water on the entire time. I've noticed that Americans do that. I get in, turn the water on to get wet, turn it off and lather up, then turn it back on to rinse off. Everyone I know (that is European) does that.
It saves a ton of water.
I also smoke, and I refuse to throw my cigarette butt on the ground. I never ever litter.

And try to get others to join you.

Just little things like that help.

__________________
I don't look like they do,
And I don't love like they do,
But I don't hate like they do,
Am I ever on your mind?

Come steal my heart.