What you should know:
As Green Whereabouts (2023) points out, "leather comes from by-products of the food industry. The animal is never raised for its hide. Tanning thus makes it possible to make use of a material that would otherwise be wasted."
Leather production has a significant environmental impact: water consumption, chemicals, solid waste. But the industry is changing. Many tanneries now adopt more environmentally friendly practices.
Natural leather, being an organic material, is biodegradable. Although the tanning process slows this biodegradation down, leather will eventually break down naturally, returning to the earth without leaving persistent toxic residues.