From the USCCB: 

"We show  our respect for the Creator by our stewardship of creation. Care for the earth  is not just an Earth Day slogan, it is a requirement of our faith. We are  called to protect people and the planet, living our faith in relationship with  all of God’s creation. This environmental challenge has fundamental moral and  ethical dimensions that cannot be ignored.

A true ecological approach always becomes a social approach; it must integrate questions of justice in debates on the environment, so as to hear both the cry of the earth and the cry of the poor. . . . Everything is connected. Concern for the environment thus needs to be joined to a sincere love for our fellow human beings and an unwavering commitment to resolving the problems of society. (Pope Francis, On Care for Our Common Home [Laudato Si'],nos. 49, 91)

The notion of the common good also extends to future generations. The global economic crises have made painfully obvious the detrimental effects of disregarding our common destiny, which cannot exclude those who come after us. We can no longer speak of sustainable development apart from intergenerational solidarity. Once we start to think about the kind of world we are leaving to future generations, we look at things differently; we realize that the world is a gift which we have freely received and must share with others. Since the world has been given to us, we can no longer view reality in a purely utilitarian way, in which efficiency and productivity are entirely geared to our individual benefit. Intergenerational solidarity is not optional, but rather a basic question of justice, since the world we have received also belongs to those who will follow us.  (Pope Francis, On Care for Our Common Home [Laudato Si'], no. 159)"