C ORNING T ECHNOLOGIES Environmental Technologies is another growth business for us, and one in which we are focusing a significant portion of our overall R&D investment. We have helped shape this industry since our invention of the ceramic catalytic converter substrate in the 1970s. Today, we are working globally with the automotive and truck industries to develop and manufacture innovative new substrate and filter products to further reduce emissions from both gasoline- and diesel-powered vehicles. By around 2008, the diesel emission control business could be as big as our automotive emission control business is today. Our new clean-air products plant in Erwin, N.Y., is expected to be up and running by mid-decade in support of this great diesel opportunity. Our Semiconductor Optics business — with some exciting new developments in the production of calcium fluoride crystals and continued breakthroughs in the creation of HPFS ® fused silica — is helping the semiconductor industry develop faster and more powerful integrated circuits. Our long-standing leadership in optical materials composition and optics design continues to be based on our unique set of skills in basic materials science, glass chemistry and metrology. S EMICONDUCTOR O PTICS:  CALCIUM FLUORIDE CRYSTALS E NABLING: MICROCIRCUIT LINES AT 1/1000 THE WIDTH OF A HUMAN HAIR 5