(d) Expresses serious concern about the situation of vulnerability and risk faced by migrants in transit and destination countries, in particular migrant children, including adolescents, who are unaccompanied or separated from their families, who are forced to flee or decide to leave their homelands owing to multip le causes, and calls upon States of origin, transit and destination to work together to find effective and sustainable solutions, including within a framework of solidarity and regional and international cooperation;