Let’s begin by clarifying that neither CTA nor CTAinvest.org offer investment advice. That being said, if you want to invest in a narrowly defined area such as very small businesses in Third World countries or “green” investments, significant due diligence is in order. It's important to do your homework and understand the risks before investing your hard earned money. You can learn more about investing in emerging markets by reading Alternative Investments at CTAinvest.org.
You may also want to consider building a well-rounded portfolio first, with a balanced mix of investments in broader asset classes such as equities, fixed-income investments and cash with specialty investing limited to a relatively small percentage of your overall portfolio.