Your answer, of course, is SCIENCE!
Our biggest focus in this regard should be replacing combustion-based energy generation with renewable electricity generation. We really have made leaps and bounds in terms of electricity generation in recent years, but unfortunately we haven't made much progress in battery technology. We've got Lithium-ion batteries now, which are capable of about four times the storage efficiency of lead-acid batteries... but we really haven't made a stride past that.
But the issue here isn't really what we're capable of producing, it's what we are producing. In an industrial economy, we could have solar panels and wind generators on every home or business in the first world, with long-distance trucking and public transportation running on electricity by now. Unfortunately, the richest parts of the world economy are all entertainment-based. We could solve this if we weren't throwing most of our money at entertainment mediums.
In short, individual efforts in our daily lives make very little difference. What we need is a change in industry.
