Let’s use waste plastic to curtail flooding

I KNOW this suggestion will fall on deaf ears because the powers-that-be have a long-term strategy to show we have no alternative to incineration.

Plastic waste could be recycled into six-feet-high cubes, each weighing several tonnes.

Each cube could be moulded so that it could be joined to the next cube. They could be placed along river banks in towns or to fight coastal erosion.