A quick read of the sentences tells us that the paragraph is about the unemployment caused by automation. The passage is best opened by 3, which provides the current state of unemployment. The politicians view globalization as the factor exacerbating unemployment. 4 contrasts this by saying that expert analysis tells a different story. It is automation that could prove to be a crucial factor. 12 forms a pair, that further elucidate the kind and scope of impact that automation has on jobs. Hence, the correct sequence would be 3412.