A local bus in Luxembourg. Photo: Fränz Bous/Flickr As discussions concluded at COP24, countries still struggle to translate their climate commitments into effective and socially acceptable…

Nancy Vandycke, Javier Morales Sarriera, Gurpreet Singh Sehmi |

Follow the authors on Twitter: @danpulido and @IrenePortabales   A branded metro station in Madrid Most metro systems around the world are unable to cover their operating costs with fare box…

Daniel Pulido, Irene Portabales González |