There are alternative methods to raise Mars' temperature, such as using solar satellites to beam sunlight onto the polar ice caps, rather than detonating hydrogen warheads.

To create a self-sustaining city on Mars, we need to improve the cost of transportation by at least a factor of a thousand.

We can bring life from Earth to Mars, creating a second planet with life, which is essential for the survival of species.

We need to establish a self-sustaining city on Mars, but currently, no amount of money could get you a ticket to Mars; we need to reduce costs significantly.

The current cost to send one ton to Mars is about a billion dollars, which is too expensive for a self-sustaining civilization.

A Mars city must be able to survive independently if spaceships from Earth stop coming, which means it needs all critical resources.

To be a multi-planetary species, we must ensure that we can return to Mars regularly, not just leave flags and footprints like we did on the Moon.

There are scientists proposing to alter Earth's orbit to change our relationship with the sun, which raises ethical concerns about such interventions.

The biggest challenge in building a civilization on Mars is getting a large number of people there who may choose to stay permanently.