The planet's biggest problems have to do with sustainability, environmental decline, global poverty, disease, conflict and so forth. Really, they're all interconnected - it's one big problem, which is that the way we're doing things can't go on.

Cities offer us powerful leverage on our most stubborn, wasteful practices. Long commutes in our cars, big power bills from our energy-hogging buildings, shopping trips to buy stuff that'll spend a few short months in our homes and long centuries in our landfills.

For carbon-neutral cities, there are things worth talking about in how our consumption patterns can change - sharing goods, etc. - but those are a fraction of the impacts of transportation and building energy use. If we need to choose priority actions, the most important things are to densify, provide transit, and green the buildings.

There are a lot of different ways of building a prosperous society, and some of them use much less energy than others. And it is possible and more practical to talk about rebuilding systems to use much less energy than it is to think about trying to meet greater demands of energy through clean energy alone.

We should really focus on an American First agenda, and these climate pacts and climate regulations have been designed to not necessarily give American workers and the American environment a head start. It really gives our competition a greater ability to compete internationally and disadvantage American companies.

Nature. That's the one thing that tips the balance in terms of living here in California. Within minutes, I can be in a desert, at the ocean, in a park, and that's the most nourishing food for my soul.

Labor believes in sustainability. We believe in acting on climate change, not just talking about it.

We have an existential crisis, which is the climate crisis. Canada is one of the laggards in the industrialized world. Our record is terrible.