from CARL SEELEY Nothing Is Perfect, But Green Movement Is Looking For Answers To the Editor: I don’t always catch Mike Zagata’s column, but every time I do, he’s revisiting the same two themes—one right, one wrong. Theme One is that even “green” technologies have negative environmental impacts. This is true, and it’s important to understand and keep in mind. When we get electricity from photovoltaics rather than coal or gas, we reduce our CO2 emissions, but we increase other…