The European Union is set to unveil a vaccine passport scheme to allow free travel this summer and support the struggling tourism sector, despite disagreement between member states over the proposal. On Wednesday, the European Commission will propose a “digital green certificate” that would combine information on vaccination, Covid-19 tests and recovery to allow people to take flights and cross borders within the bloc. Portugal has welcomed the proposal but Belgium and Germany have warned against discriminating against those who refuse or cannot get vaccinated.