The evidence is overwhelming that even simple changes can be...

The evidence is overwhelming that even simple changes can be a big help and have a huge cumulative impact. If every American switched just three light bulbs to compact fluorescent bulbs, it would be the equivalent of taking 3.5 million cars off the road. If everyone switched to a car with five miles-per-gallon better mileage, that would be equal to the taking another 150 million automobiles off the roads. Individual actions add up to big changes.