On a family visit with my 12-year-old niece to Philadelphia recently, my niece, Helen, solved climate change. She suggested that we, on Earth, find a planet in our galaxy with a species that breathes in carbon dioxide and exhales oxygen and that we trade with them. Brilliant idea, but until we find that planet with “Carbon Breathers,” Pennsylvania state legislators have mapped out a smart plan to keep the state’s nuclear plants (which avoid 37 million tons of carbon dioxide every year, the equivalent of 8 million cars) up and running.