What's the environmental impact of bio & SVO?

Bio puts out no pollutants but laughing gas. How cool is that?
SVO has the same environmental impact as frying food whatever that is.
Both are based on agriculture rather than fossil fuels. By using bio-diesel or SVO you are supporting recycling and agriculture rather than the oil industry. No war required for dirty grease, it'll be a long time yet before anyone will start a first-fight over a grease dumpster.