You can make a difference. If you don't do all of these, choose one and start now:

Replace the conventional bulbs in your three most-used light fixtures with earth-friendly bulbs.

Clean your air filter.

Insulate. Seal air leaks, especially in the attic and basement.

Call your energy company and switch to green power.

Recycle.

Drink water from a glass rather than from a plastic bottle.

Use water outside during the coolest part of the day.

What other suggestions do you have?