Of three possible municipal wastewater (sewage) effluents evaluated as a source of N and P, the most effective was source-separated urine with a very high content of these elements, in which case growing algae became more environmentally beneficial than the land-based crops.

FORBES: Report Says Algal Biofuels May Not Cut Carbon Emissions, But Read More Closely

The bottom line is that effective email marketing relies on consumer data to drive content, offers, timing and many other elements of message strategy.

FORBES: Are Email Marketing Security Issues Undermining Your Brand?