Somewhat unrelated: what are your issues with libertarian policy?

I don't think it's at all unrelated.

Their general sentiment is consistent with many of the issues you listed.

It is. That's why I used to be a (literally) card carrying member. But at the end of the day, the party has too many places where we differ (gun control, health care, and education are three places where I just can't support the party's platform anymore, for instance). Also, it's got way too many creepy members calling for the abolishment of age of consent laws. I know it's just a vocal few, but it skeeves me.

Regarding the green party, I am strongly pro conservation and against rampant consumerism and corporate greed, but I'm not confident that the government will solve the problems without making things worse and wasting tons of money in the process

I'm not confident either, but the free market hasn't done a great job, and other countries have had a great deal of success with regulation. Heck, we've had success with regulation.