The Pope is concerned about Global warming, feeling that if it endangers the planet it behoves humanity to do something about it. American politician Rick Santorum disgrees, telling the Pope to leave science to the scientists. He should focus on theology and morality.
Apart from the fact that Santorum doesn't seem to realize that there are moral aspects to a great many subjects, including science, he does not seem to be aware that the Pope is himself a qualified scientist. He holds a master's degree in chemistry. So much for leaving science to the scientists.