An article in the New Scientist issue number 2682 gave answers to the question above and many other eco questions, e.g. why can't the machines in my gym be used to generate electricity? or How clean does the pizza box have to be for it to be recyclable? Are laminated juice cartons recyclable? and 22 other eco questions. I would like to summarise these in a blog, but as there are so many interesting questions and answers to deal with in one go, I thought I would do a couple each day or every other day, depending on how busy my day is with deadlines at CAB Abstracts. I'm starting with the 3 questions I mentioned above. The blog title question will be the last in the series. Read on to find out the answers.