Any tip about a green business to start?

I'm an unemployed man, 46 y.o. and in my country, Brazil, i m too old to find job. i always focus my life to do the right thing, being honest, ethical person and I will raise my two sons with this values. I would like to know if any person abroad, with a good heart and a good "aim" in business will give me a tip, a way to begin a new business to make a better world. May be something to save energy, recycling things, to give to me ? I really appreciate a tip, an idea, or even so a word of wisdom and hope. Thanks a lot to everyone who just read this. my e-mail is cidadaniadf@yahoo.com.br