Is a recent term from a 2004 Scott MacDonald  ‘Towards an ecocinema‘ article (can be downloaded below), further defined in 2010 in Framing the world, explorations in ecocriticism and film, ed. Paula Willoquet-Maricondi (I have written a short post about this book here)

ecocinematic films:

‘are films that

• overtly engage with environmental justice concerns or those that make ‘nature’ from landscapes to wildlife, a primary focus…they have broader philosophical implications of what it means to inhabit this planet.. to be a member of this ecosphere and to understand and value this community in a systemic and non-hierarchial way’
• sometimes aspire to present more biocentric and/or ecocentric viewpoints rather than overtly anthropocentric – human centered views or interpretation of natural phenomena)
• cut across genres, modes of production
• may include full-length and short fiction, documentary, exp. films/video

‘ecocinema actively seeks to inform viewers about, as well as engage their participation in, addressing issues of ecological importance, raising awareness, and at times, political action