You can find out everything that you need to know about Fairtrade at
http://www.fairtrade.org.uk/My take on it is that if someone labours to produce raw materials or a product they should be paid a decent amount for their efforts. The current trading systems generally benefit bigger corporations at the expense of the producers, with many workers being treated no better than slaves.
Most people in poorer parts of the world don't want charity, they want to be supported to take control of their lives to better their lives, the lives of their family, and for their community. No different to any of us. Producers are guaranteed a minimum price which means that they are not at the mercy of the stock marketeers who bet on prices, changing their value. It benefits the environment because if you live somewhere where you work it is unlikely that you will pollute the drinking water or spray vicious chemicals on yourself, your friends and family. It benefits the community as it means that producers can commit money to community facilities, as well as be able to send their children to school and get healthcare for the family. Quite basic things that we all take for granted. More can be read about the mechanics of this at
http://www.fairtrade.org.uk/what_is_fairtrade/fairtrade_is_unique.aspx .
If you want to see an example of the production of non fairly traded bananas you could look no further that Jan Nimmo's excellent film 'Bonita: Ugly Bananas'
http://vimeo.com/jannimmo/videos which shows the aggressive management style and the shocking working conditions of banana growers.
Get in touch if you can help.