Using virtual world, a scientist in Japan can conduct an experiment using a special facility in California, watching the entire thing via a live stream - and possibly controlling the experimental equipment remotely. We can use that same kind of technology to control a robot on Mars.

To be fair, if we are having a mass extinction, we're in the early stages of it. I think it's knowing facts like that which has made me less fearful about the future. Mass extinction is a long, complicated process that we are just now beginning to understand - and likewise, we are just beginning to understand how we might prevent one.

In fact, the early demographer Thomas Malthus believes that the only way the human population would ever check itself was by running headlong into a disaster, like a pandemic or famine. Sometimes we get so frustrated with the slowness of human political processes that we wish a giant flaming rock would solve the problem for us.

Amphibians are dying out like crazy, and frogs and salamanders may be largely extinct by the end of the twenty-first century. Imagine an animal that begins its life in the water, but ends it on land - already, that's pretty weird. But, also, a lot of them are incredibly tiny and look wildly improbable. They have funny little toes, they stretch their throats into weird bubble shapes when they croak, and some of them are poisonous to the touch. I think kids from the twenty-second century might mythologize amphibians the way kids today mythologize dinosaurs.

My first goal would be to reduce the perturbation in the carbon cycle. That would mean using carbon neutral sources of energy, and changing our agricultural practices to be less disruptive and polluting. I'm not talking about a policy here so much as changing the way our infrastructure works. That's why I'm so fascinated with changing the way we build cities, because they are the most developed forms of physical infrastructure for human habitation.

Some time ago we discovered the carbon cycle - a long-term set of chemical reactions that govern climates based on how much carbon is free in the atmosphere. At that point, it became clear that humans were affecting our environments far more profoundly than we realized. By releasing so much carbon and greenhouse gas into the environment, we're making long-term changes to every aspect of the natural world.

think we're still stuck in that agricultural mindset, where we imagine that we can shape the Earth. Sure, we can do that. But the Earth has the power to shape us much more powerfully. To survive climate change, we'll have to realize how dependent we are on our ecosystems for our own survival.