Take a look at some companies who are taking a hard-headed approach to sustainability issues and building strong brand and marketing strategies:

Walmart, who have launched a sustainability index that will change the footprint of millions of SKUs across the US
http://walmartstores.com/Sustainability/9292.aspx

Nike, whose Considered Design ethos drives product development along the whole supply chain
http://www.nikebiz.com/responsibility/considered_design/design_ethos.html

Toyota, whose brand values are underpinned by a commitment to building sustainable growth
http://www.toyota.com/productleadership/#/Efficiency

P&G, whose latest report Designed to Matter gives innovation a pivotal role to create sustainable growth, citing a target of at least $50 billion in cumulative sales of sustainable innovation products
http://annualreport.pg.com/annualreport2009/sustainability/index.shtml

HSBC, where a sustainable approach to lending and investment is at the heart of its CSR strategy
http://www.hsbc.com/1/2/sustainability/sustainable-finance