So says The Economist’s Robert Lane Greene:

So which one should you, or your children, learn? If you take a glance at advertisements in New York or A-level options in Britain, an answer seems to leap out: Mandarin. China’s economy continues to grow at a pace that will make it bigger than America’s within two decades at most. China’s political clout is growing accordingly. Its businessmen are buying up everything from American brands to African minerals to Russian oil rights. If China is the country of the future, is Chinese the language of the future?

Probably not. Remember Japan’s rise? Just as spectacular as China’s, if on a smaller scale, Japan’s economic growth led many to think it would take over the world. It was the world’s second-largest economy for decades (before falling to third, recently, behind China). So is Japanese the world’s third-most useful language? Not even close. If you were to learn ten languages ranked by general usefulness, Japanese would probably not make the list. And the key reason for Japanese’s limited spread will also put the brakes on Chinese.

This factor is the Chinese writing system (which Japan borrowed and adapted centuries ago). The learner needs to know at least 3,000-4,000 characters to make sense of written Chinese, and thousands more to have a real feel for it. Chinese, with all its tones, is hard enough to speak. But  the mammoth feat of memory required to be literate in Mandarin is harder still. It deters most foreigners from ever mastering the system—and increasingly trips up Chinese natives.

Greene goes on to discuss why even native Chinese speakers are losing their fluency in written Chinese. Fascinating stuff. I had no idea.

But why choose French? Greene again:

If your interests span the globe, and you’ve read this far, you already know the most useful global language. But if you want another truly global language, there are surprisingly few candidates, and for me French is unquestionably top of the list. It can enhance your enjoyment of art, history, literature and food, while giving you an important tool in business and a useful one in diplomacy. It has native speakers in every region on earth. And lest we forget its heartland itself, France attracts more tourists than any other country—76.8m in 2010, according to the World Tourism Organisation, leaving America a distant second with 59.7m. Any visit there is greatly enhanced by some grasp of the language. The French are nothing but welcoming when you show them and their country respect, and the occasional frost that can greet visitors melts when they come out with their first fully formed sentence. So although there are other great languages out there, don’t forget an easy, common one, with far fewer words to learn than English, that is almost certainly taught in your town. With French, vous ne regretterez rien.