"Vegan leather" is plastic.
"Vegan wool" is plastic.
"Vegan fur" is plastic.
Every wash cycle releases microplastics into the water. Every year it degrades slightly and releases more. At end of life it will sit in landfill for four hundred years or end up in the ocean.
The sheep, meanwhile, grows a new coat every year, requires it removed, and produces a fibre that has been biodegradable since the Neolithic.
But yes. The sheep is the environmental problem.
The sheep, standing in the Lake District in the rain, growing renewable fibre from grass.
The sheep.