It is totally possible to build a new company that is green from the get-go and also designed to be profitable. As Stan and Robert note, if you're not profitable, you go out of business and all your green initiatives are wasted. I'd say it's actually easier to bake in the commitment to a better world than to try to graft it on later, into a corporate culture that may not support it.
But I believe it's actually easier to profit if you go beyond "sustainability" to "regenerativity." Companies whose products and services don't just keep things from getting worse but actually make things better will have an easier time finding markets and becoming profitable. I explain the basics of this in my 15-minute TEDx talk, "Impossible is a Dare": my TEDx Talk, "Impossible is a Dare: Business for a Better World" http://www.ted.com/tedx/events/11809
This is the kind of consulting I specialize in.
Henry Pineda, tell us more. Maybe I can help. There are already a lot of companies building for disassembly rather than destruction at end-of-life, especially in Europe. Susan McPherson and Julie Trell, I'm on my way to check out your pages. Might be some ways we can collaborate. Jim Bowes, right as usual. Kooveli, it doesn't have to be that way AT ALL, and sooner or later, most companies will realize that sacrificing ethics is also a sacrifice of long-term profitability.