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(NAPSI) - There's a myriad of strategies for investing in the stock market, from intuitive speculation and astrological forecasts to "hot tip" sheets and neural networks, which consider countless variables to make computer-generated buy-or-sell decisions. Yet it is the tried-and-true methods that tend to yield consistent results--such as investing in a good product and good management team.

There is also a strong argument for investing in a particular "economic theme" or market segment. Getting in on the ground floor of companies with great technology and management engaged in a rapidly growing, economy-driving market segment always provides the best combination of security and success.

History has many examples of successful "theme" investing that provided substantial investment returns. One of the most notable examples is the transportation industry. Investors didn't necessarily need to know what segment of the automotive industry was the best, but rather that they were buying good companies that were part of the overall driving theme of a "moving" economy, a market and/or industrial segment. The same approach was true of investors who properly identified the theme of work-efficiency gains resulting from the advent of personal computing and telecommunications technologies.

So what is the theme today? Call it the green revolution, or what the major investment banks are calling Cleantech. The rising costs of energy, depletion of the Earth's natural resources, severe weather phenomena and concerns about the consequences of carbon in our atmosphere have all combined to make us rethink how we design and construct our buildings. Policymakers have acted, and 22 states and Washington, D.C. now have green building mandates; more will follow. Structural insulated panel (SIP) manufacturers and solar technology companies, as well as energy and water efficiency companies, will likely lead this new sector. Cleantech companies in wind, solar and biofuels have already doubled and tripled in value over the last several years.

In short, investment success in the next few years will be defined as "go green to make green." Alternative Construction Technologies, Inc. (Symbol: ACCY, OTCBB, www.actechpanel.com) and Open Energy Corporation (Symbol: OEGY, OTCBB, www.openenergycorp.com) are two promising ground-floor Cleantech companies.

The former has a state-of-the-art, disaster-resistant SIP technology that reduces utility bills by up to 70 percent while providing ease of use and other benefits. The latter has developed photo-voltaic tiles, roofing membranes and architectural glass products that provide renewable energy and protect the structure from the elements. More ideas can be found at Progressive Investor.com, GreenDreamJobs.com and SavannahCapital.com.

Energy-efficient ACTech structural insulated panels combined with Open Energy solar roof tiles provide zero-energy buildings.