Pope ends first leg of his three-nation South American tour with impassioned plea to safeguard the environmentDelivered message in Ecuador, which has one of the world's most diverse ecosystems but is also reliant on oil He said: 'As stewards of these riches, we have an obligation toward society and toward future generations' (...) 'As stewards of these riches which we have received, we have an obligation toward society as a whole and toward future generations,' Francis said. 'We cannot bequeath this heritage to them without proper care for the environment, without a sense of gratuitousness born of our contemplation...