What is the single most effective thing I could do to reduce my carbon footprint?

The long-running series in which readers answer other readers' questions on subjects ranging from trivial flights of fancy to profound scientific and philosophical conceptsWhat is the single most effective thing I could do to reduce my carbon footprint? Without dying, preferably. Andrew Hufnagel, CaithnessPost your answers (and new questions) below or send them to nq@theguardian.com. A selection will be published on Sunday. Continue reading...