To survive, humans need food, water, and air. Yet biodiversity, the Earth's bodies of water, and the planet's atmosphere are all under threat.

Trees and clean energy [are] the long-run solution but we have no time to wait for the long run. We need a short-run solution now, and one that encourages and facilitates the transition to the long-run solution.

We need a transformation of the world economy and of how we use and share the Earth's resources. We are running out of time. We are truly at the point of no return.

Carbon negative power plants can provide energy while they overcome poverty and change economic values in the right direction.

Geoengineering means changing the Earth's fundamental large-scale processes.

Technology is a many-headed monster and perhaps it would be better to regress to a safer past and avoid technological change; it is tempting to think like that.

The consensus is that climate change ranks along with nuclear warfare as the top two risks facing human civilization.