is proving problematic. it can be mechanically or chemically recycled. the problem is that the volumes are so small that it doesn't make any sense that the current plastic recycling infrastructure collects and sorts our material out. so for this to really work it needs to be scaled — both to bring the cost down, but also to make sure that these materials are recognised for recycling. the technology is there, though, and hopefully soon when it comes to plastic, we won'tjust have to suck it up. spencer: hmm, and lara assures me that was just water. right, let's turn from packaging now to what is in the packaging. producing food is itself not that green. farming contributes more than 8% of all greenhouse gases. we are already beyond the boundaries of what the world can sustain in terms of human population, so we need to be much more efficient in what we do.