I have posed three challenges for myself which will reduce my carbon-footprint.
1. Start using the reusable green bags instead of plastic bags.
2. Use less water, ie. have shorter showers, turn off taps when I'm not using them, etc.
3. Recycle more paper and plastic
You should try setting yourself some goals too; if you want to save the earth, we need as many people to pitch in and reduce their carbon-footprint as possible.