6. DuPont (1802)
Material science is one of the fundamental disciplines of green technology. You wouldn’t see advances in desalination membranes, LEDs, solar wafers, wind turbines or electrodes without dedicated labs of chemists cooking tinkering with molecule sets.
Last year, we saluted Dow Chemical on this list for its activities in water, lithium-ion batteries and solar. DuPont participates in the same markets, but last year also purchased industrial enzyme maker Danisco for $6.3 billion. Danisco not only already makes a green rubber for tires, it produces a large number of additives for food.
Keep your eyes on 3M, which showed off an interesting thin-film solar concentrator at Solar Power International, and Monsanto, which invested in algae maker Sapphire Energy.