If...
If we keep the air conditioner on low, we'll conserve energy.
If....
If we take reusable shopping bags, we'll conserve energy.
If...
If we grow our own vegetables, we'll conserve energy.
If...
If we use energy-saving light bulbs, we'll conserve energy.
If...
If we take public transportation, we'll conserve energy.
If...
If we dry our clothes outside, we'll conserve energy.