Energy Update

MEXICO CITY, Sept 28 (Reuters) - Tropical Storm Marty strengthened as it moved north toward Mexico's Pacific coast on Monday, threatening to dump heavy rain on the southwest of the country, the U.S.

* Glencore slides 30 percent, underscores commodity concern * Copper drops back under $5,000 a tonne * Fed's Dudley says rate hike could come in October (Updates with close of U.S. markets, oil settlement prices) By Chuck Mikolajczak NEW YORK, Sept 28 (Reuters) - Global equity markets and commodities slumped on Monday, pulled lower by worry over the economic health of China and other big emerging markets in a week filled with key economic data.

WASHINGTON, Sept 28 (Reuters) - Republican U.S. Representative Kevin McCarthy, the leading candidate to be the next Speaker of the House of Representatives, voiced sharp disagreement with President Barack Obama on Monday on foreign policy issues from Ukraine to Iran.

If the September 25, 2015 meetings in Washington between President Obama and President Xi of China yield no additional, substantive agreements to ease the tensions between the two countries in the arenas of monetary policy, currency devaluation, cyber-warfare or China's military build up in the Southeast Asian theater, they will be noted in the annals of environmental history for having yielded a historic, landmark commitment by China to start a national program in 2017 that will limit and pu