Deep Green Resistance is a great radical feminist and radical environmentalist group which does a lot of good work around the United States. I think their guidelines for male allies are worth reading.
It is not enough for us to be “good guys.” It is not enough to personally refrain from exploiting women. It is not enough for us to be personally conscientious and respectful to women. It is not enough to maintain equality in our own relationships with women. While all of those things are important, abstaining personally from outright oppressive behavior doesn’t challenge patriarchy as a system of power. Basic decency commands that we work alongside women to uproot and dismantle this entire patriarchal system– within ourselves, within our groups and communities, and within institutions and the culture at large.