Sally Rogers took public transport, bought locally-grown food and looked for sustainable products out of concern for the environment in San Francisco. Then she realised all that was being undone by her need to travel.
Her solution was to subscribe to Project Wren, one of a new breed of climate-centric startups offering consumers a way to offset greenhouse-gas pollution. In a nod to the music and video streaming providers Spotify Technology SA and Netflix Inc, they offer a web-based tool to quantify individual carbon emissions and then make regular payments into projects that will absorb those emissions.