The Sun is getting brighter; in less than a billion years it will be too intense for Earth's oceans to continue to exist. Like Mars did in ages past, Earth is going to lose it's water.
On the other side of the balance, Earth's interior is cooling, geological activity is diminishing, and so volcanic replenishment of the atmosphere is slowly winding down.
We have less than a billion years. We are half-way through the era of animals on Earth.
Anthropogenic Global Warming exists. It's a tragedy, but it's only a blip in the larger span of the ages. Humans are going to set fire to all the fossil fuels we can possibly get our hands on and we'll do so as fast as we possibly can. Nothing anyone says or believes will change this fact.
We only get one pass at this fossil fuel heritage.
Which means we are right now living in the decades of maximum wealth. If life is to continue, life must branch out off the planet. If this is going to happen, we have to be the ones to do it, and we have to do it now.
Earth is not sustainable. We have to go right now.
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