Why "Buying into the Green Movement" works

Because of me wanting to join half the class and do the most popular article, I am analyzing "Buying into the Green Movement" by Alex Williams. My thesis statement for the moment is as follows: Alex Williams is successful in using irony and exaggeration as devices to convey his points and subliminally convince those with an interest in the green movement to take more action other than just buying eco products. There was a bit of internal debate of whether or not the article really works to convey its message. The main problem that I had was his concluding statement that people who are buying the products view it as a first step and want to do more. To me this seems to undermine the article's call to action by making it sound like people are already moving towards reducing consumption. While mentioning it alone doesn't add to the mix, the fact that it's the last taste that the reader has from the article seems to pull the rug from under the article. However, when considering the overall article and its great use of exaggeration and pointing to the sheer irony of people effectively making no change in the environment by buying products illustrates his point well and leaves memorable bits of information that still sway the reader. He constantly goes through the shopping lists of the eco-minded to appeal his point and is very successful at showing how the products don't contribute to solving the true problem. In spite of the Achilles’s heel, the article still manages to pull it off by presenting a colorful and expressive view of the situation.