"Little things...used to mean so much to Shelley..."

In the category of 'Ideas du Jour ', allow me to suggest a relatively painless way to feel like an environmentalist.
I am calling it the '10% Solution', which encompasses the concept and the praxis in a pithy phrase.

Just do ten percent less.

Eat ten percent less food.

Go out ten percent less.

Buy ten percent less junk.

Drive ten percent slower.

It would have a considerable impact. Lets take the case of driving ten percent slower.
Assuming 10 percent of the North American population take this up, this would mean:
Not burning 3,993,183,000 barrels of oil per year.

Assuming traffic fatalities scale linear with velocity, this would save 350 lives per year.
That is the equivalent of a jetliner crashing!
Its hard to scale actual accidents: a slower moving person has more time to react to a situation, and potentially turn an accident into a near-miss. But even so, it seems reasonable that around 4000 non-lethal accidents would be avoided, but probably more.
Driving slower is considerably less stressful, and driving stress shortens lives as more than one study can attest.
The average commute to work is 25.5 minutes. A Ten-Percenter gets to work in 28 minutes, and can have a happy and productive workday as a happy cog, content in having done their bit to 'Save the Earth'.