Driving a gasoline powered car is getting more expensive these days as a consequence of the war with Iran and the closure to most oil tankers of the Strait of Hormuz. Our industrial and consumer world is still largely energized and sustained by oil, and about 20% of the global consumption of about 100 million barrels per day must pass unimpeded through that narrow gap in the Persian Gulf. Limit supplies and the price goes up. So, while the subject of oil is current and the price of gasoline has our attention, this is an opportunity to consider the environmental implications of what we are doing as consumers of these fossil fuels.