This document discusses the resource issues faced by top brands like Gap Inc., Nike, Adidas, Mark & Spencer, Aditya Birla, and Asos and how they manage them sustainably. It also explores the value propositions of these brands. Gap Inc. is reducing the use of non-sustainable fibres and water, Nike is reusing materials and factory scrap, Adidas is using robot technologies and recycled polyester, Mark & Spencer is becoming a zero net waste business, Aditya Birla is using sustainable packaging material and recycling plastics, and Asos is reducing packaging and reusing waste. The document also discusses the value propositions of these brands.