The United States has already fallen behind its rivals in developing new, clean energy technology, posing a major risk to long-term security, a group of retired military officers warned on Tuesday.

Energy demand is expected to soar by at least 30 percent over the next three decades as China’s middle class grows and countries across Africa and South Asia emerge from poverty. And, thanks to aggressive investments in nuclear, hydro and renewable energy, China and the European Union are far better-positioned to dominate those new markets, according to a new 66-page report from the CNA Military Advisory Board.

“American resolve at this point has not been sufficient to put us into the lead,” Lee Gunn, a retired U.S. Navy vice admiral, told HuffPost by phone. “We fear the instability around the world in everything from trade to political influence that will result from the reduction in American views, values and economic and political power.”

Losing control over emerging energy industries could damage national security, said retired Lt. Gen. Richard Zilmer of the U.S. Marine Corps.

Workers walk near wind turbines for generating electricity, at a wind farm in Guazhou, China.

“Leader of the free world post-World War II is something we very comfortably fell into,” Zilmer told HuffPost by phone…