Trees benefit us in even more ways than you knew.

Manufacturing traditional ink is a pretty dirty business -- it produces a lot of pollutants called volatile organic compounds (VOCs). Soy ink produces much less.

The answer to this depends on the definition of hybrid, and how long it would take to "convert" each car on the road to a hybrid. One thing's for sure -- emissions would be significantly lower.

The technicalities of anti-litter laws.