ROME - On Thursday top Vatican officials hailed Swedish teen Greta Thunberg, recently named TIME Magazine’s “Person of the Year” for her environmental advocacy, as a “great witness” of Church teaching on care for creation and the human person. Speaking to reporters at the Dec. 12 publication of Pope Francis’s message for the 2020 World Day of Peace, celebrated on Jan. 1 each year, Cardinal Peter Turkson, prefect of the Vatican office for Integral Human Development, called Thunberg “a great witness to what the Church teaches on the care of the environment and the care of the person.” “What is...