Wisconsin State Journal: Gov. Scott Walker has deep concerns that significantly reducing carbon pollution in Wisconsin over the next 15 years is unworkable. Yet in the same letter to President Barack Obama last week, Walker touted Wisconsins 20 percent reduction in carbon dioxide emissions over the last decade. So we have made a lot of progress, and we can make more. Wisconsin needs a can-do spirit to combat climate change, not skepticism that sticks to the status quo. Of course Wisconsin can continue to reduce its...