"Extreme natural phenomena caused by climate changes provoked by human activity are growing in intensity and frequency (cf. Laudato Deum, 5), to say nothing of the medium and long-term effects of the human and ecological devastation being wrought by armed conflicts. [...] For believers it is also a duty born of faith, since the universe reflects the face of Jesus Christ, in whom all things were created and redeemed. In a world where the most vulnerable of our brothers and sisters are the first to suffer the devastating effects of climate change, deforestation and pollution, care for creation becomes an expression of our faith and humanity."
January 1, 1970
https://en.wikiquote.org/wiki/Climate_change