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For consumers, the easiest way to make a difference is to give up plastic shopping bags and plastic water bottles, which contribute more to plastic pollution than any other products. Then comes plastic packaging, which is a little more complicated. It is easy to point out examples of excessive packaging, but plastic does have the virtue of being lighter than paper, cardboard and glass, which gives it a smaller carbon footprint. For food especially, recyclable plastic packaging is probably the best option.
For the hull and cabin of the Plastiki, the team was enthused about recycled plastic lumber until they discovered that it sags badly unless reinforced with glass rods. Now they are excited about self-reinforcing PET, a new product manufactured in Denmark, similar to fibreglass but fully recycled and recyclable. When heat-fused to boards of PET foam, it appears to be capable of withstanding the battering of Pacific waves for a hundred days, although the effect of salt water on the material is still unknown. Dry ice in the two-litre bottles hardens them without losing any flotation, although some of the bottle caps have managed to work themselves loose and are now being resealed with what de Rothschild calls 'a very cool bio-glue' made from cashew nuts and sugar.