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Address these environmental issues and you will address every issue known to man. And we keep dabbling in things that aren't really that important in the long term.

My main issue is sustainability of the Earth, and protection of those animals and people who dwell here.

Climate change is happening, humans are causing it, and I think this is perhaps the most serious environmental issue facing us.

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.

There are a tremendous amount of environmental issues that are on the table.

The most important issue we have to deal with is freedom of movement.

There isn't a more important issue in the world than global warming. Even the Cold War and the Bay of Pigs crisis were a notional threat.

I have long understood that climate change is not only an environmental issue - it is a humanitarian, economic, health, and justice issue as well.

There are more effective ways of tackling environmental problems including global warming, proliferation of plastics, urban sprawl, and the loss of biodiversity than by treaties, top-down regulations, and other approaches offered by big governments and their dependents.