John Kerry, Biden’s special envoy for climate, gave a keynote address at the Vatican and will have a private meeting with Pope Francis.

Humanity either must live up to its responsibility or continue on a path of self-destruction, Pope Francis said, commemorating Earth Day with a video message.

The evidence of severe climate change is everywhere; but we still have the opportunity to reinvent ourselves, to stimulate the creation of new activities, thanks to innovative and sustainable solutions, both for nature and for humankind.

President Biden's turnabout on the Paris climate accords was cheered by environmental activists in Africa, a continent that contributes a tiny amount to the problem of global warming but stands to suffer mightily because of climate change.

Climate change and environmental destruction are forcing millions from their homes, and Catholics have a responsibility to assist them, Pope Francis wrote.

The recovery will be lengthy, and while we desperately need immediate relief, we must also seek long-term systemic change.