Readers reply: 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, CaithnessSend new questions to nq@theguardian.com. Continue reading...