You could warm Mars up, over time, with greenhouse gases.

NASA has been one of the most successful public investments in motivating students to do well and achieve all they can achieve. It’s sad that we are turning the programme in a direction where it will reduce the amount of motivation and stimulation it provides to young people.

Earth might one day soon resemble the planet Venus.

You need to be in the position where it is the cost of the fuel that actually matters and not the cost of building the rocket in the first place.

We’re working on New Glenn, which is our orbital vehicle, but we have in our mind’s eye an even bigger vehicle called New Armstrong.

Some scientists believe climate change is the cause of unprecedented melting of the North Pole, and that effects these very uncertain weather patterns. I think we should listen to those scientists and experts.

The Eagle has landed.

If humanity doesn’t land on Mars in my lifetime, I would be very disappointed.

The squandering of oil and gas is associated with one of the greatest tragedies, not in the least resolved, which is suffered by humankind: climate change.

We’re taking all of the lessons that we have from New Shepard and incorporating them into New Glenn.

SpaceX is only 12 years old now. Between now and 2040, the company’s lifespan will have tripled. If we have linear improvement in technology, as opposed to logarithmic, then we should have a significant base on Mars, perhaps with thousands or tens of thousands of people.

In order for us to have a future that’s exciting and inspiring, it has to be one where we’re a space-bearing civilization.

Houston, Tranquillity Base here. The Eagle has landed.

The thing that’s made me open my eyes to what was happening to the environment and climate was films and documentaries.

My vision is for a fully reusable rocket transport system between Earth and Mars that is able to re-fuel on Mars – this is very important – so you don’t have to carry the return fuel when you go there.

Land on Mars, a round-trip ticket – half a million dollars. It can be done.

The effects of climate change are real and must be acted on.

I thought the attractions of being an astronaut were actually, not so much the Moon, but flying in a completely new medium.

The future of humanity is going to bifurcate in two directions: Either it’s going to become multiplanetary, or it’s going to remain confined to one planet and eventually there’s going to be an extinction event.

Would you bet your paycheck on a weather forecast for tomorrow? If not, then why should this country bet billions on global warming predictions that have even less foundation?

Avoiding climate breakdown will require cathedral thinking. We must lay the foundation while we may not know exactly how to build the ceiling.

I am not deeply involved in Australian politics but I know there are prime ministers, governments around the world who are not acting responsibly in relation to climate change.

Science fiction, to me, has not only things that wouldn’t happen, but other planets.

Most emissions aren’t caused by individuals, they’re caused by corporations and states.

I think my message to the politicians who have within their power the ability to make change is, ‚Do you really, really not care about the future of your great-grandchildren? Because if we let the world continue to be destroyed the way we are now, what’s the world going to be like for your great-grandchildren?‘

The pace of progress on Mars depends upon the pace of progress of SpaceX.

It’s not as though we can keep burning coal in our power plants. Coal is a finite resource, too. We must find alternatives, and it’s a better idea to find alternatives sooner then wait until we run out of coal, and in the meantime, put God knows how many trillions of tons of CO2 that used to be buried underground into the atmosphere.

Even if producing CO2 was good for the environment, given that we’re going to run out of hydrocarbons, we need to find some sustainable means of operating.

I know Elon, we’re very like minded in many ways. We’re not conceptual twins. One thing I want us to do is go to Mars, but for me it’s one thing. He’s singularly focused on that. I think motivation wise, for me I don’t find that Plan B idea motivating. I don’t want a plan B for Earth, I want Plan B to make sure Plan A works.

I would like to fly in space. Absolutely. That would be cool. I used to just do personally risky things, but now I’ve got kids and responsibilities, so I can’t be my own test pilot. That wouldn’t be a good idea. But I definitely want to fly as soon as it’s a sensible thing to do.

The boundary between space and the earth is purely arbitrary. And I’ll probably always be interested in this planet – it’s my favorite.

The first stories I wrote when I was 12 were about Mars and landing on Mars.

You need to live in a dome initially, but over time you could terraform Mars to look like Earth and eventually walk around outside without anything on… So it’s a fixer-upper of a planet.

The Apollo program certainly had no real commercial value. It was done for very different reasons and, I think, very good reasons for the time. It’s an extraordinary achievement of mankind, but it wasn’t sustainable.

It’s not going to do any good to land on Mars if we’re stupid.

SpaceX has the potential of saving the U.S. government $1 billion a year. We are opposed to creating an entrenched monopoly with no realistic means for anyone to compete.

Let’s pray that the human race never escapes from Earth to spread its iniquity elsewhere.

People will visit Mars, they will settle mars, and we should because it’s cool.

We should no longer measure our wealth and success in the graph that shows economic growth, but in the curve that shows the emissions of greenhouse gases.

Perhaps one day I will go into space.

People are unaware of what is going on. When I talk to people, they know the basics, they know the planet is warming because of greenhouse gases… but they don’t know the actual consequence of that.

We fly to 106 kilometers. We’ve always had as our mission that we always wanted to fly above the Karman line because we didn’t want there to be any asterisks next to your name about whether you’re an astronaut or not.

I feel very strongly that SpaceX would not have been able to get started, nor would we have made the progress that we have, without the help of NASA.

By the time we see that climate change is really bad, your ability to fix it is extremely limited… The carbon gets up there, but the heating effect is delayed. And then the effect of that heat on the species and ecosystem is delayed. That means that even when you turn virtuous, things are actually going to get worse for quite a while.

This is the moment when we must come together to save this planet. Let us resolve that we will not leave our children a world where the oceans rise and famine spreads and terrible storms devastate our lands.

There have to be reasons that you get up in the morning and you want to live. Why do you want to live? What’s the point? What inspires you? What do you love about the future? If the future does not include being out there among the stars and being a multi-planet species, I find that incredibly depressing.

Ronald Reagan used to alarm his Soviet counterparts by saying that surely they’d both unite against an invasion from Mars.

I think we have a good chance of surviving long enough to colonize the solar system.

At places like Davos, people like to tell success stories. But their financial success has come with an unthinkable price tag. And on climate change, we have to acknowledge we have failed.

At Virgin, we have always backed the power of the entrepreneur and inventor to find solutions to tricky problems. Why should climate change and the battle against carbon be any different?

Two kids in their dorm room can’t start anything important in space today. That’s why I want to take the assets I have from Amazon and translate that into the heavy-lifting infrastructure that will allow the next generation to have dynamic entrepreneurialism in space, to build that transportation network.

We need every person on Earth to acknowledge that climate change is real and encourage each other and our leaders to address the challenge.

Our economic system, run for profit and waste and based primarily on the extractive industries, is the cause of climate change. We have wasted the earth’s treasure and we can no longer exploit it cheaply.

I think there are more politicians in favor of electric cars than against. There are still some that are against, and I think the reasoning for that varies depending on the person, but in some cases, they just don’t believe in climate change – they think oil will last forever.

Sweden is not a green paradise, it has one of the biggest carbon footprints.

I think we are at the dawn of a new era in commercial space exploration.

We’re running the most dangerous experiment in history right now, which is to see how much carbon dioxide the atmosphere… can handle before there is an environmental catastrophe.

Millions of people were inspired by the Apollo Program. I was five years old when I watched Apollo 11 unfold on television, and without any doubt it was a big contributor to my passions for science, engineering, and exploration.

I mean, people aren’t continuing like this and not doing anything because they are evil, or because they don’t want to. We aren’t destroying the biosphere because we are selfish. We are doing it simply because we are unaware.

It’s time for the human race to enter the solar system.

War contributes greatly to global warming, which shouldn’t surprise us. All those bombs going off, all those rockets, all those planes and helicopters. All that fuel of various kinds being used. It pollutes the air and water of this very fragile and interconnected planet.