Manage your waste
Separate your garbage at home. Reuse what you can, send those that can be recycled to recycling plants, and collect organic waste for compost. By managing your waste properly, you will be able to send only those meant for landfills.

Make do with things you already have
Buy less crap. Next time you go out shopping, resist the temptation of purchasing trinkets, thingamabobs and what sits you only find cute but really don’t have any use for at all. Instead, make do of things you already have.

Go for organic food
When doing grocery, go for produce from local farmers. Local produce reduces the need for transporting food. It’s healthy for you and the environment.

Get a reusable bag
A reusable bag when going shopping not only is it convenient (carrying all your grocery in a single bag), it also lessens plastic bags that end up in the trash every minute.

Switch to energy-saving appliances
You can start by switching to energy-saving appliances. Check the energy label – more stars means more energy efficient.

Line dry your washed clothes
Instead of using the dryer, line dry newly washed clothes and sheets. It saves electricity and forces you to exercise altogether.

Choose safer cleaning products
When purchasing cleaning materials, choose those with ingredients that have less impact on the environment and human health. You can also choose those with recyclable packaging to reduce garbage.

Green up your work space
Commit  to turning off electronics in your office every night.  Have your whole department do this for maxium impact.

Green your ride
Evaluate how you currently get to work each day and make a pledge to reduce your impact.  If you can ride the bus, bike, walk, or car pool, make this pledge.

Never buy bottled water again
Trade your bottled water habit for an at-home filtering pitcher; pair it with a reusable bottle

Brew your own Fair Trade coffee
Carrying your own coffee in an insulated travel mug helps you reduce waste from cardboard cups and carrying sleeves.

Cut back on paper towels
Invest in a few cotton cloths and some fabric napkins; then drop them in the wash when you run a load of laundry. Using the cloth alternatives is just as easy as using the paper versions.

Become a weekend vegetarian
Cutting meat out of your diet just two days a week can decrease your carbon footprint by about 1/3 of a ton — and coming up with meat-free meals for Saturday and Sunday isn’t as hard as it sounds. Try pancakes and fruit for breakfast; fresh salads or roasted vegetable sandwiches for lunch; and veggie pizza, bean soups, and creamy risottos for dinner. And since doubling a recipe rarely adds any time to your prep work, you can make extras to eat throughout the week (and trim your carbon footprint even more).

Replace your lightbulbs
Replacing your lightbulbs with compact fluorescent lights may be the ultimate change for the eco-slacker.

Sources:
GreenBlog
Naspa
Mother Nature Network

More Ideas:
Times Union
Green Moxie
Healthy Voyager
Eco Women