I was just reading about the oceans being contaminated with micro plastics, They say fleece is a big contributor as it breaks up easy and gets carried in the wind. It is used more and more commercially to get crops to grow quicker and into the shops faster so I expect it is the big commercial users who they will be blaming. But nearly everyone of us uses it, just add up the acreage on all the allotments world wide and we make a big contribution. I think I will go back to collecting old cotton window netting to use instead.