We had a lot of ecological or "green" waves the past decades that not necessarily died but for some reason have disappeared to the background. Just a few; the irreversible gigantic hole in the ozone layer caused by too much farting cows and what not, acid rain that would kill all vegetation, the disastrous greenhouse effect caused too much CO2, global warming and the soon expected biblical floods, that horrible nuclear energy, our too big ecological footprint, etc. Since the economy has collapsed we haven't heard too much of all that. All of those topics are of general interest and concern. Did we all buy small cars since? We (hopefully) are more aware of wasting and saving energy at home? We are taking better care (hopefully) of how much food we buy and throw out, unused. How much water do we waste each day? Are we selecting our garbage because we want it or because it's the law? Let's be honest, we don't really care too much of the general public's concern. We don't like "we", we love "me". That's why we liked Montignac, Nouvelle Cuisine and since a few years the Mediterranean cookbooks and thousands of stupid diets.
There is definitely a new wave already going on where food is concerned and it's living more healthy, or better yet, merely being aware that living healthy is important, which is more a personal concern and has little to do with ecology. People are getting obese by over-consumption, let's call it simply over-eating and a total lack of exercise. All the sudden there's a gigantic market for healthy food and fitness centers. That's the trend that is happening right now and will stay for a while. Pre-packed, ready-to-use, so-called health food,... oh please!
Also worth mentioning is the newest trend of sourcing local food and the revival of forgotten products, artisanal products and grandma's recipes. I love it, but it has been here since the slow-food movement started! Is it going to stay? Probably, but it will get less focus in the near future, just like all trends.