Global stocks gain on commodities rise, China; dollar falls

By Gertrude Chavez-Dreyfuss NEW YORK (Reuters) - Stocks rose worldwide on Tuesday supported by a rally in commodities such as copper and precious metals, while the U.S. dollar fell on investor caution ahead of a news conference by U.S. President-elect Donald Trump on Wednesday. European stock markets, which had opened broadly lower, edged back towards recent one-year peaks, while Wall Street shares traded higher. Oil prices were lower on the day but were off their weakest levels of the previous