This is CBS. I am the world. I am John Bachelor. The Climate. For the 21st Century,

I welcome Professor Stephen Kuhnen, a fellow at the Hoover Institution, writing most recently

the factual context for climate and energy policy. Stephen is the author of the extremely useful and I look forward to talking at length

about book Unsettled, what climate science tells us what it doesn't and why it matters. We'll attend immediately to the

professor's paper for Hoover because it begins with a recommendation that the Greeks

taught us, balance in all things. that the the Is that balance now in place Stephen or is it in ambition good evening to you good evening good evening

You know energy is so

Entwined in all aspects of society that if you want to try to change the balance,

you're going to change a lot of other things as collateral effects if you like.

And so we've got to be very careful in thinking through how we go about changing our energy system. Many people say it's out of balance at the

moment that we're emitting too much carbon dioxide and other greenhouse gases into the

atmosphere is the result of our energy needs

and that that is endangering the planet.

On the other hand, the world needs energy and it's going to need a lot more energy in the next several decades.

So that is the issue of balance that I think one has to try to understand and make some decision about.

We come to the word models.

Models is a wonderful part of science these days because it allows you to look into the future.

However, there are questions about models and how

useful they are right now. If I understand Professor best to use models of the

historical record than it is to look out for a century. Is that correct?

Well, certainly the historical record is very important because it tells us how the climate has changed in the past and in particular the natural variations of the climate in the past.

We need to understand those natural variations because they're the background against which present and future changes, whether natural or human cost, play out.

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