Commentary A few days ago, my husband and I were chatting about the freezing weather in Texas and the resulting blackouts. My daughter got grumpy when she heard us and said, “So you don’t believe in global warming?” “Not necessarily. If you want to convince me, answer my questions,” my husband said. “First, is it true that we have global warming? See how cold Texas gets and how much snow we are getting.” “Scientists said these are caused by global warming! I can find out,” said my daughter. “OK. Second, if global warming is true, is it caused by carbon dioxide or by human activities? Third, would it help if the US and Europe stopped emitting carbon dioxide while China can do whatever it wants? You know, the emissions from China are more than those from the United States and Europe combined.” “Global warming is an interesting topic for my …