Our 'hyperconsumer' society promotes all sorts of forms of useless consumption in order to keep capitalism expanding. Vast amounts of hours go into looking after the bureaucracy that is necessary in a capitalist economy. As capitalism expands it takes more and more from both the land and the average person, giving the benefits to a select few. For the anarchist, ecological problems will not be able to be solved until all problems of domination, hierarchy and the expansionist nature of capitalism are solved. Unlike some greens, anarchists do not believe that bad environmental practices just happen.
Ideas are products of given social relationships.
Thus anarchists cannot agree with 'eco-consumerism' which is quite content to leave all the modes of domination intact so long as people buy 'green' products. Changing your buying habits can reduce wastage and promote more environmentally sound practices. However, most environmentally damaging activity occurs in the process of production. Thus it is far better to reject consumerism, and consider what we truly need to enjoy life. Doing so will probably give you more time and money to do things which you consider worthwhile.