The United States Conference of Catholic Bishops (USCCB) tell us that "We show our respect for the Creator by our stewardship of God’s creation. Care for the earth is a duty of our faith and a sign of our concern for all people. We should strive to live simply to meet the needs of the present without compromising the ability of future generations to meet their own needs. We have a moral obligation to protect the planet on which we live—to respect God’s creation and to ensure a safe and hospitable environment for human beings, especially children at their most vulnerable stages of development. As stewards called by God to share the responsibility for the future of the earth, we should work for a world in which people respect and protect all of creation and seek to live simply in harmony with it for the sake of future generations." (Faithful Citizenship,USCCB, 54).
To learn more about the USCCB's teaching on Care for God's Creation, read their 1991 document, Renewing the Earth.