so it doesn't take an awful lot to flummox me intellectually,

but I'm going to read this question

from an interview earlier this year:

"Philosophically, does the constant supply of information

steal our ability to imagine

or replace our dreams of achieving?

After all, if it is being done somewhere by someone,

and we can participate virtually,

then why bother leaving the house?"

I'm usually introduced as a polar explorer.

I'm not sure that's the most progressive or 21st-century

of job titles, but I've spent more than two percent now

of my entire life living in a tent inside the Arctic Circle,

so I get out of the house a fair bit.

And in my nature, I guess, I am a doer of things

more than I am a spectator or a contemplator of things,

and it's that dichotomy, the gulf between ideas and action

that I'm going to try and explore briefly.

The pithiest answer to the question "why?"

that's been dogging me for the last 12 years

was credited certainly to this chap, the rakish-looking gentleman

standing at the back, second from the left,

George Lee Mallory. Many of you will know his name.

In 1924 he was last seen disappearing into the clouds

near the summit of Mt. Everest.

He may or may not have been the first person to climb Everest,

more than 30 years before Edmund Hillary.

No one knows if he got to the top. It's still a mystery.

But he was credited with coining the phrase, "Because it's there."

Now I'm not actually sure that he did say that.

There's very little evidence to suggest it, but what he did say

is actually far nicer,

and again, I've printed this. I'm going to read it out.

"The first question which you will ask

and which I must try to answer is this:

What is the use of climbing Mt. Everest?

And my answer must at once be, it is no use.

There is not the slightest prospect of any gain whatsoever.

Oh, we may learn a little about the behavior

of the human body at high altitudes,

and possibly medical men may turn our observation

to some account for the purposes of aviation,

but otherwise nothing will come of it.

We shall not bring back a single bit of gold or silver,

and not a gem, nor any coal or iron.

We shall not find a single foot of earth that can be planted

with crops to raise food. So it is no use.

If you cannot understand that there is something in man

which responds to the challenge of this mountain

and goes out to meet it, that the struggle

is the struggle of life itself upward and forever upward,

then you won't see why we go.

What we get from this adventure is just sheer joy,

and joy, after all, is the end of life.

We don't live to eat and make money.

We eat and make money to be able to enjoy life.

That is what life means, and that is what life is for."

Mallory's argument that leaving the house,

embarking on these grand adventures is joyful and fun,

however, doesn't tally that neatly with my own experience.

The furthest I've ever got away from my front door

was in the spring of 2004. I still don't know exactly

what came over me, but my plan was to make

a solo and unsupported crossing of the Arctic Ocean.

I planned essentially to walk from the north coast of Russia

to the North Pole, and then to carry on to the north coast of Canada.

No one had ever done this. I was 26 at the time.

A lot of experts were saying it was impossible,

and my mum certainly wasn't very keen on the idea.

(Laughter)

The journey from a small weather station on the north coast

of Siberia up to my final starting point,

the edge of the pack ice, the coast of the Arctic Ocean,

took about five hours, and if anyone watched fearless

Felix Baumgartner going up, rather than just coming down,

you'll appreciate the sense of apprehension,

as I sat in a helicopter thundering north,

and the sense, I think if anything, of impending doom.

I sat there wondering what on Earth I had gotten myself into.

There was a bit of fun, a bit of joy.

I was 26. I remember sitting there

looking down at my sledge. I had my skis ready to go,

I had a satellite phone, a pump-action shotgun

in case I was attacked by a polar bear.

I remember looking out of the window and seeing the second helicopter.

We were both thundering through this incredible Siberian dawn,

and part of me felt a bit like a cross between Jason Bourne

and Wilfred Thesiger. Part of me

felt quite proud of myself, but mostly I was just utterly terrified.

And that journey lasted 10 weeks, 72 days.

I didn't see anyone else. We took this photo next to the helicopter.

Beyond that, I didn't see anyone for 10 weeks.

The North Pole is slap bang in the middle of the sea,

so I'm traveling over the frozen surface of the Arctic Ocean.

NASA described conditions that year as the worst since records began.

I was dragging 180 kilos of food and fuel and supplies,

about 400 pounds. The average temperature for the 10 weeks

was minus 35. Minus 50 was the coldest.

So again, there wasn't an awful lot of joy or fun to be had.

One of the magical things about this journey, however,

is that because I'm walking over the sea,

over this floating, drifting, shifting crust of ice

that's floating on top of the Arctic Ocean is

it's an environment that's in a constant state of flux.

The ice is always moving, breaking up, drifting around,

refreezing, so the scenery that I saw for nearly 3 months

was unique to me. No one else will ever, could ever,

possibly see the views, the vistas, that I saw for 10 weeks.

And that, I guess, is probably the finest argument for leaving the house.

I can try to tell you what it was like,

but you'll never know what it was like,

and the more I try to explain that I felt lonely,

I was the only human being in 5.4 million square-miles,

it was cold, nearly minus 75 with windchill on a bad day,

the more words fall short, and I'm unable to do it justice.

And it seems to me, therefore, that the doing,

you know, to try to experience, to engage, to endeavor,

rather than to watch and to wonder, that's where

the real meat of life is to be found,

the juice that we can suck out of our hours and days.

And I would add a cautionary note here, however.

In my experience, there is something addictive

about tasting life at the very edge of what's humanly possible.

Now I don't just mean in the field of

daft macho Edwardian style derring-do,

but also in the fields of pancreatic cancer,

there is something addictive about this, and in my case,

I think polar expeditions are perhaps not that far removed

from having a crack habit.

I can't explain quite how good it is until you've tried it,

but it has the capacity to burn up all the money I can get my hands on,

to ruin every relationship I've ever had,

so be careful what you wish for.

Mallory postulated that there is something in man

that responds to the challenge of the mountain,

and I wonder if that's the case whether there's something

in the challenge itself, in the endeavor, and particularly

in the big, unfinished, chunky challenges that face humanity

that call out to us, and in my experience that's certainly the case.

There is one unfinished challenge

that's been calling out to me for most of my adult life.

Many of you will know the story.

This is a photo of Captain Scott and his team.

Scott set out just over a hundred years ago to try

to become the first person to reach the South Pole.

No one knew what was there. It was utterly unmapped

at the time. We knew more about the surface of the moon

than we did about the heart of Antarctica.

Scott, as many of you will know, was beaten to it

by Roald Amundsen and his Norwegian team,

who used dogs and dogsleds. Scott's team were on foot,

all five of them wearing harnesses and dragging around sledges,

and they arrived at the pole to find the Norwegian flag already there,

I'd imagine pretty bitter and demoralized.

All five of them turned and started walking back to the coast

and all five died on that return journey.

There is a sort of misconception nowadays that

it's all been done in the fields of exploration and adventure.

When I talk about Antarctica, people often say,

"Hasn't, you know, that's interesting,

hasn't that Blue Peter presenter just done it on a bike?"

Or, "That's nice. You know, my grandmother's going

on a cruise to Antarctica next year. You know.

Is there a chance you'll see her there?"

(Laughter)

But Scott's journey remains unfinished.

No one has ever walked from the very coast of Antarctica

to the South Pole and back again.

It is, arguably, the most audacious endeavor

of that Edwardian golden age of exploration,

and it seemed to me high time, given everything

we have figured out in the century since

from scurvy to solar panels, that it was high time

someone had a go at finishing the job.

So that's precisely what I'm setting out to do.

This time next year, in October, I'm leading a team of three.

It will take us about four months to make this return journey.

That's the scale. The red line is obviously halfway to the pole.

We have to turn around and come back again.

I'm well aware of the irony of telling you that we will be

blogging and tweeting. You'll be able to live

vicariously and virtually through this journey

in a way that no one has ever before.

And it'll also be a four-month chance for me to finally

come up with a pithy answer to the question, "Why?"

And our lives today are safer and more comfortable

than they have ever been. There certainly isn't much call

for explorers nowadays. My career advisor at school

never mentioned it as an option.

If I wanted to know, for example,

how many stars were in the Milky Way,

how old those giant heads on Easter Island were,

most of you could find that out right now

without even standing up.

And yet, if I've learned anything in nearly 12 years now

of dragging heavy things around cold places,

it is that true, real inspiration and growth

only comes from adversity and from challenge,

from stepping away from what's comfortable and familiar

and stepping out into the unknown.

In life, we all have tempests to ride and poles to walk to,

and I think metaphorically speaking, at least,

we could all benefit from getting outside the house

a little more often, if only we could sum up the courage.

I certainly would implore you to open the door just a little bit

and take a look at what's outside.

Thank you very much.

(Applause)