When has Spain been a absolute monarchy recently, I think Spain became a Parliamentary Monarchy with the Cortes de Cadiz in 1836

Yes, but it’s actually not that great for the enviornment since in Spain normally the plastic foil and aluminium layer is not separated for recycling. The only part that gets recycled is the external cardboard layer.

It actually use to be mandatory in Spain since the dictatorship and until 20 years ago or so.