Simplify your life! Only keep the things you use the most or enjoy on a regular basis!

Reduce purchases - Think about what you want and what you need - try not to buy too much of what you want and look at whether you need it or not. It will reduce rubbish and reduce how much you hoard.

Have a tree-free home! - Reuse used paper for note paper; write messages to roomates or family on a whiteboard or other reusable item; dont buy paper napkins/plates/cups; try to do printing on paper you dont need anymore or easily biodegradable paper; purchase bleach free toilet paper; make your own cards/letters using pre used paper or other craft items; wash and reuse cloth napkins, towels etc rather than buying paper ones.

Buy bulk - Try to buy things in bulk rather than in single servings - muesli bars, juice etc

Avoid trash - avoid creating trash, for example when ordering take aways, avoid asking for extra straws, napkins etc

Shopping bags - Bring your own plastic ones back for reuse or buy reusable fabric bags and use them instead.

Opt out of junk mail - put a sign on your mailbox "no circulars" and dont subscribe to things that are pointless.

Pack a waste free lunch - use reusable plastic containers rather than food wrap.

Carry a mug with you for drinks rather than using paper/plastic cups.

Hold garage sales - one mans trash is another mans treasure.

Buy reusables - Buy leg shavers that you only need to replace the head rather than single use razers, reusable diapers, bags, towels, writing things etc

Donations - donate your old clothes, toys etc to the salvation army or a similar group.

Recycle - recycle plastics, glass, paper products or buy recycled products.

Food - Buy organic or low gi food, its healthier for you and the environment.

Consider becoming a vegetarian - eat less meat as  animals produce healthy gasses that keep the environment clean and healthy.

Conserve energy - Turn off or store away unused electrical appliances, chart the number of litres of gas or kms driven each week/month.

Conserve water - there are many ways to do so! Collect rain water for farm water etc.