Adaptation and innovative socio-economic responses to environmental change in metropolitan areas of Valencia and Zaragoza. R+D+I Project, funded by the Ministry of Research, Science and Universities. Government of Spain Co-funded by the European Union. The MET-CHA project analyses the factors conditioning the response and the possibilities of adaptation in metropolitan areas of Valencia and Zaragoza, as an example of second-tier Spanish metropolises, to climate change and its social and environmental consequences