Sigh. For reasons I don't entirely understand, I receive emails from Travel Neutral, a company that specialises, according to its website, in 'carbon offset and planet-aware holiday deals' like the one advertised in the image. To be honest, they aren't my kind of holiday firm, because I don't consider going on holiday a good enough reason to fly, but out of interest I followed a link to the company they use for offsetting .  The good news is that they offer a good range of sensible green schemes from tree planting to renewable energy projects. The bad news is that using these for offsetting is mostly greenwash. The idea of offsetting is that at the moment we all have to do things that generate greenhouse gasses. So you pay a little money to a scheme that will reduce greenhouse emissions, and this will balance out your contribution to climate change. But unless the amount of money you contribute will reduce carbon emissions (or equivalent) by at least the amount you ...