So lovely to see so many people prepared to give up glitter :) I think we will get used to not having it, but it would be a very sad world if we have to give up fish and penguins. Not to mention the beautiful coral reefs that support so much life.
Glitter gets everywhere as barbara says and we all know!! Bras, hair, noses!! So it is easy for it to end up in the water system. But it is also damaging in the soil for invertebrates and for the chemicals it leaches.
As for tinsel, its great to keep what you have got but it is made from PVC (a terribly polluting substance in its own right and a known carcinogen and containing phthalates) but it also cannot be recycled, so it would end up in landfill, slowly leaching its chemicals into the soil and water.
[https://www.recyclenow.com/what-to-do-with/christmas-decorations-1]
12.5 million metres of tinsel is made/sold every year... [http://www.bbc.com/news/av/uk-38394661/how-is-tinsel-made]
I think we have got used to just binning it if we fancy changing our colour scheme and not thinking about the consequences :(
But I do think that we could easily get used to becoming more eco friendly at Christmas - whether you think of it as the birth of Jesus, a celebration of winter and the coming spring, or as a happy holiday for family and children, it doesn't really make any sense to make it a polluting and toxic experience.
Bring on the fir tree sprigs!!