10. Tata Group (1868)

Like Samsung, but more sprawling. The Indian conglomerate is known to many in the West for producing the Nano, the $2,500 car. But it also produces steel, chemicals, energy, beverages, composites, electronics, owns hotels and has consultants around the world. Jaguar and Daewoo are two sub-brands.

Thus, it is both a big consumer and a producer of energy. The current goal is to replace 25 percent of its own fossil fuel consumption with renewables by 2017. Like others on the list, it has startup investments: It owns a piece of Sun Catalytix, the MIT spinout that wants to convert water to hydrogen with sunlight and proprietary catalysts.

On top of that, the conglomerate -- and the Tata family behind it -- remains one of the most important and influential in India when it comes to pursuing social goals through technology. (The family built the Indian Institute of Science.) As green grows in India and Southeast Asia, so will this group.

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