They go from eight cents a mile in 2010, to four cents a mile in 2015, to two cents a mile by 2020.

That's a 2,000 mile journey.

Yeah, I'm a million mile flyer.

Satawal is one half mile long by one mile wide.

So in a sense this is an absolute zero carbon, zero fossil fuel electric mile at two cents a mile by 2020.

I walked three fourths of a mile.

We fly about a mile above the surface.

My house is only a mile from here.

Maybe the last mile problem really should be thought of as the last mile opportunity.

Now, a six mile wide rock is very large.

So it's about a mile across, 600 feet deep.

The desert was advancing by a mile or two a year.

But a trained liespotter can spot a fake smile a mile away.

That's what I'm talking about as a last mile opportunity.

So this is what you call a last mile problem.

You can walk a mile when it comes to understanding why that person's driving 40 miles per hour in the passing lane, or your teenage son, or your neighbor who annoys you by cutting his lawn on Sunday mornings.

This is the last mile.

I walked about 1 mile.

To give you a sense of scale, this is about a mile wide.

The last mile is, everywhere, problematic.

This river is one mile across.

But this is a five meter telescope has about a quarter mile focal length.

Trawling a zooplankton net on the surface for a mile produces samples like this.

And today, you would see this inside the mine, half a mile underground.

The fastest woman to ever run a mile did it in 4 15.

And whosoever shall compel thee to go a mile, go with him twain.

The shopping center is one mile ahead.

The average depth at the top of it is about a mile and a half.

And these guys orbited a 30 or no, about a 22 mile long asteroid called Eros.

So, how do we tackle the last mile?

I mean, and only one mile is visible.

Today 2010, in volume, when we come to market, it is eight cents a mile.

Here I have a bunch of other examples, all suffer from the last mile problem.

On a 42,000 mile mountain range. Great job security, but not the way to go.

We're going to look at the mid ocean ridge, a 40,000 mile long mountain range.

So that's all water under the sea a mile and a half, two miles, three miles down.

In 2004, two St. Helenian fishing vessels developed the capacity to fish beyond the 12 mile inshore waters of the island's 200 mile exclusive economic zone.

And the inconsistencies create, fundamentally, this last mile problem.

Diarrhea, and many last mile problems, are like that.

If you had to walk a mile for a jug of water every day, as millions of people do, it's unlikely you'd use that precious water to bathe. Young entrepreneur Ludwick Marishane tells the amazing, funny story of how he invented a cheap, clean and convenient solution DryBath, the world s first bath substituting lotion.

Now that last mile, last foot, in a sense, is the first step of the infrastructure.

So, let me now talk about the last mile problem.

But you know what we do on the last mile?

Three hours of bottom time, average distance traveled one mile.

It's about three miles out of Nairobi, and it's a mile long and about two tenths of a mile wide, where over half a million people live crammed in these little tin shacks, generation after generation, renting them, often eight or 10 people to a room.