All these challenges and drawbacks of the society so far, must
be supported by an (1) agriculture/algaeculture providing food
and feed in a sustainable way using as less freshwater as it can
be; (2) intensive wastewater treatment and/or desalination of
brackish and salt water; (3) production, as much as possible, of bioenergy
and biofuels using economically and environmentally more
sustainable renewable energy sources