The Japanese Prime Minister, Yoshihiko Noda says, Japan has no choice but to restart its idled nuclear reactors by the middle of next year in spite of growing public opposition to nuclear power. More than 20,000 people marched in Tokyo this week to demand an early end to the use of nuclear power. But Mr. Noda told the Wall Street Journal in an interview that it is impossible for Japan to get by without the plants, most of which have been shut down since the catastrophic accident at the Fukushima nuclear power. He said Japan cannot afford to let the plants remain closed because a shortage of power will damage Japan's overall economy.Power shortages have slowed Japan's return to full production since the March earthquake and Tsunami disaster. Tough energy conservation measures have been imposed on homes, offices and factories.