NEW YORK - The wine industry may be among the very few in which a leading figure will smile broadly when asked about climate change and declare, “I love it.” Egon Müller, owner of the famed Scharzhof estate in Germany’s Saar Valley, made the comment at Riesling Rendezvous, a conference in Bellevue, Washington. Müller is elated because growers in cooler-climate regions like the Saar often struggle to achieve ripeness in their grapes, and warmer temperatures are helping.But what happens when it gets too warm, as scientists predict, for some grape varieties to grow optimally in some regions?