"We're continuing to emphasize conventional energy, solar, shipping, agriculture, and commodities," says Harry Domash, who adds, "But one industry we've overlooked so far is coal."

In his Winning Investing, he explains, "This month, we're adding two coal industry picks. One, a short-term play to capture the action in hot coal mining stocks, and the other, a long-term dividend-paying investment."

"We've avoided coal primarily because environmentally speaking, coal is bad news. Coal is mostly used to generate electricity and to power steel plants. Crude oil prices are so high because supply can barely meet demand.

"Think about what would happen to oil prices if coal wasn't available. Due to increasing global demand, coal prices are moving up dramatically and it doesn't make sense for us to ignore that.

"For longer-term investors, we recommend Natural Resource Partners (NYSE: NRP), a master limited parternship. The MLP owns coal properties in the Appalachia, Illinois Basin, and the Western U.S. NRP leases its properties to mine operators.

"Profits from coal may be even bigger than from gold, which is viewed as coal's more glamorous and higher profile rival," notes Nick Vardy.

The editor of The Global Bull Market Alert explains, "The Market Vectors Coal ETF (NYSE: KOL) enables you to buy a basket of 39 coal-related companies from 12 different countries." Here's his overwiew of the exchange-traded fund.

"Despite its status as the most 'environmentally incorrect' source of energy, coal provides 25% of the world's energy and generates about half of the electricity in every state in the United States, except California.

"Coal plays a key role in the production of steel, with approximately 70% of the global steel production depending on coal as a source of energy. And the price of coal has been soaring to record levels.