Now Green Means Business.(Global Investor)

For any company with a supply chain, if they want to continue being profitable, they have to reduce their carbon footprint.

Environmental concern is suddenly all the rage, all around the world. Unless you've been buried in a coal mine for the past year, you've been inundated with articles about this hot new trend. In early July, China lifted gasoline subsidies, in part to force consumers and businesses to confront the costs of using more of that ever-more costly resource. The central government has also been aggressively forcing the closure of inefficient cement and aluminum factories across the country in an effort to make overall production more cost-effective.

Meanwhile, even as the U.S. government recently failed to pass legislation limiting carbon emissions, U.S. companies led by behemoths such as General Electric, Wal-Mart, Google, Dupont Chemical and others have been launching new green initiatives. These two realities--of the largest companies in the world adopting environmentally friendly business practices and the largest country in the world aggressively seeking to reduce energy consumption--signal a new seriousness about "sustainability," the word for long-term growth that doesn't deplete natural resources and lowers emissions of greenhouse gases.

The reason: sharply higher prices for oil and raw materials have changed the landscape for countries and global corporations, making reductions in energy use economically viable and strategically important in a way that no amount of green activism ever could. Any company with a supply chain and global operations must either reduce its oil consumption, and so its carbon footprint, or rapidly see its profits eaten up by fuel bills.

Think about it: global growth is roughly 4 percent a year, and companies have to grow well above that to be seen as healthy enterprises and attractive investments. Meanwhile, the price of oil has risen to $130 a barrel, and the prices of raw materials such as copper, steel, cement, paper and any sort of energy have gone up three, four, five or more times in the past two years. While raw materials are usually less than 15 percent of overall expenses, those figures have been growing lately. CEOs and CFOs are feeling a new urgency to reduce costs, and energy conservation strategies have suddenly been transformed into an answer.

Consider Wal-Mart CEO Lee Scott, who has quickly turned his controversial retailer into a poster child for environmentally aware business. To maintain its razor-thin margins at a time of record oil prices, which are raising the cost of importing goods from China, Wal-Mart has been radically altering how ...