The greenest city on Earth

I've a confession to make as the Seoul Summit nears the end. I have become fiercely competitive on climate change. That's why - in an interview with a powerful American outlet - I made the bold prediction here that London will be the greenest city on earth by 2012.

That deadline is more important to me than other Mayors at this conference because that's when the world comes to London for the Olympics. It's clearly a tough target but I am - my friends - determined to do my best to meet it.

On stage today I encouraged every delegate to join us for the Games - and tried to tempt them with my dream of what they could see on arrival.

Stepping off the train at Paddington, I'd invite them to pedal onwards using one of the beautiful bikes available for hire every 150 metres in central London by next summer.

The roads should be easier as they ease onto a cycle super highway, breathing sweeter air as they pass cars generating no fumes and little noise. Thousands of trees, planted as we speak, will be filtering the air and casting cool shadows over the pavements.

The claustrophobic clutter will have gone, our urban realm subtly but strikingly more attractive. There'll be plants growing on roofs, railway sidings and canal boats. London's parks will have harvested the large investment now going into them.

London by then will be out of the global recession - helped by the new opportunities in the green economy, the City of London leading the world in green financial instruments.

Construction will have been helped by a massive programme of retrofitting homes. We don't want to be lagging behind on lagging. We'll be generating electricity from what is now considered waste. And our low carbon zones will pioneer the very best and latest in environmentally sound products and practices.

This sounds utopian, but it's well within grasp. But it won't come through warm words and communiques which is why my stubborn call - here in Seoul - is for real action to make this dream for many of us come true.

Promoting London in China

Great party at London House. Loads of athletes and all the stars. Had lots of fun with Jimmy Page, Leona Lewis and David Beckham. Also met Jackie Chang on top form.

Delighted with London House and thrilled that the LDA put it together so well whille spending around 30% less than Ken Livingstone had planned.

They've also put it to extremely good commerical use. Over the last few days I've been dropping in on various brunches, lunches and dinners. Elegant people have held orderly meetings in quiet rooms away from the party goers and the press.

And today I learn that more than a hundred Chinese companies have held talks about doing business in London. Around 30 have expressed a serious interest in moving ahead.
This morning - I struck a deal with one of them. Geong makes software for online banking and trading - among other things. They recently listed on AIM and I was thrilled to hear them say how much better their experience was of our Alternative Investment Market than the other exchanges they'd looked at around the world.

Henry Tse told me in perfect English that opening an office in London is the logical next step and he's just signed a letter of intent comitting to that as he seeks to grow his business in Europe.

A London taxi is now set to drive around 12 Chinese cities seeking other opportunities. I dread to think what the fare would be, but on the basis of the last few weeks, I'm confident the customer - in this case London - will be getting a bargain.

An amazing closing ceremony

What can I say?! The fireworks - I expected. Cunning choreography on massive scale would always be there. But enormous drums dangling a hundred feet above the most awesome percussion unit ever was pretty spectacular.

Then came the weird wheels and strange carnival floats that were both quaintly old fashioned and strikingly high tech. It was hard to know where to look - up or down, left or right, foreground or distance. Throughout I was terrified of missing a gem and if you missed the whole thing you really ought to make time to catch up.

I felt immense pride watching Britain's athletes taking their place. And then a heady cocktail of anticipation and mild anxiety spotting the red carpet which would take me to the centre of this pageant to receive the flag. By the standards of the overall ceremony my task was so humble, involving four swings of such stunning simplicity that I cannot claim any credit for not messing it up.

But it was nevertheless a moment of intense pride for me - pride in Team GB who had a fantabulous games, pride in the people behind their efforts, and greatest pride of all that London - my home - is now the official capital of world sport and the next Olympic and Paralympic Games.

London 2012 - building on Beijing

Intimacy. That's how London can build on Beijing.

Everyone has their particular passion, but everyone also asks how London can possibly match what we've witnessed here in China.

The honest answer is that it will be hard. In terms of scale, I dare say its impossible, but as I see it, that is not necessarily a bad thing.

Stratford is more compact and I'd generally really like to see a more intimate feel to the whole exercise than we've witnessed here. Also noticed a significant number of empty seats which we must avoid in 2012 as the world's best have a right to expect a capacity crowd to perform to.

Determined that Londoners who are paying extra for these games and particularly our kids get to witness this spectacle.

Let's also make sure that corporate sponsors rsvp their intentions - so any unwanted tickets are passed on. And when those who have taken their tickets vacate their seats, let's ensure they - again - are reallocated to those who'll enjoy and appreciate the sport as much as I do.