Greenwire: For many students enrolling in alternative energy programs at community colleges, it’s not about some greater environmental ethos. It’s about jobs. That message has resounded at Lansing Community College, about 90 miles northwest of Detroit, where some students are former employees of now-shuttered General Motors Co. plants. Enrollment in the school’s alternative energy programs has spiked this year, accounting for the campus’s largest growth area. Over the last year alone, the …