The optimism of Mark Stevenson

The former pop star and cryptographer who knows how to save the world.

With swaths of Australia's eastern seaboard underwater, this week's New Statesman has a timely piece on the simple idea that could stop the country's destructive cycle of drought and flood. (You'll never guess what it is.)

It's written by Mark Stevenson, whose book An Optimist's Tour of the Future was published yesterday. It has received stellar reviews all over the place and is one of the most interesting science books I've read for a long time.

It turns out that Mark's got the best back story since Brian Cox – he, too, was in a pop band (they were big in Chile) and he was also a cryptography expert. Now, he's a stand-up comedian, writer and educator, trying to find out whether we're all doomed.

He has decided to take an optimistic – but rational – look at what the future might hold for us as a species. In his own words:

I've travelled over 60,000 miles across four continents, talked to more than 30 geniuses, met four robots and had two terrible conversations with computers. I've contemplated immortality, the end of capitalism and a new age of human evolution. In the process, I've attended an underwater cabinet meeting, helped invent one cocktail, been insulted in the outback, made a brace of new friends and had near-death experiences. I'm not the same person I was when I started.

The contentious subjects covered by the book include the human genome, nanotechnology, genetic engineering and renewable energy. Stevenson tackles them in an approachable way by focusing on the individual stories of the (often quite eccentric) people involved.

One of them is Aubrey de Grey, the gerontologist whose work on rodents makes him think that people can live to a 1,000 years old (as long as we don't get fat). You can see de Grey in action at a Ted talk here. Not only does he have the best beard in science, he might be the fastest talker you'll ever hear.

Mark also met a Columbia University professor called Klaus Lackner, who's developed a cheap and efficient way to scrub CO2 from the atmosphere – and now needs $20m to build a commercial prototype.

Then there's the controversial futurist Ray Kurzweil, who believes that humans will soon merge with technology and become a new species. (I knew my Xbox had been looking at me oddly.)

You can read more about the book (and Mark's pop career) here.

Helen Lewis is deputy editor of the New Statesman. She has presented BBC Radio 4’s Week in Westminster and is a regular panellist on BBC1’s Sunday Politics.

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The campaign to keep Britain in Europe must be based on hope, not fear

Together we can show the world a generous, outward-facing Britain we can all be proud of.

Today the Liberal Democrats launched our national campaign to keep Britain in Europe. With the polls showing the outcome of this referendum is on a knife-edge, our party is determined to play a decisive role in this once in a generation fight. This will not be an easy campaign. But it is one we will relish as the UK's most outward-looking and internationalist party. Together in Europe the UK has delivered peace, created the world’s largest free trade area and given the British people the opportunity to live, work and travel freely across the continent. Now is the time to build on these achievements, not throw them all away.

Already we are hearing fear-mongering from both sides in this heated debate. On the one hand, Ukip and the feuding Leave campaigns have shamelessly seized on the events in Cologne at New Year to claim that British women will be at risk if the UK stays in Europe. On the other, David Cameron claims that the refugees he derides as a "bunch of migrants" in Calais will all descend on the other side of the Channel the minute Britain leaves the EU. The British public deserve better than this. Rather than constant mud-slinging and politicising of the world's biggest humanitarian crisis since the Second World War, we need a frank and honest debate about what is really at stake. Most importantly this should be a positive campaign, one that is fought on hope and not on fear. As we have a seen in Scotland, a referendum won through scare tactics alone risks winning the battle but losing the war.

The voice of business and civil society, from scientists and the police to environmental charities, have a crucial role to play in explaining how being in the EU benefits the British economy and enhances people's everyday lives. All those who believe in Britain's EU membership must not be afraid to speak out and make the positive case why being in Europe makes us more prosperous, stable and secure. Because at its heart this debate is not just about facts and figures, it is about what kind of country we want to be.

The Leave campaigns cannot agree what they believe in. Some want the UK to be an offshore, deregulated tax haven, others advocate a protectionist, mean-hearted country that shuts it doors to the world. As with so many populist movements, from Putin to Trump, they are defined not by what they are for but what they are against. Their failure to come up with a credible vision for our country's future is not patriotic, it is irresponsible.

This leaves the field open to put forward a united vision of Britain's place in Europe and the world. Liberal Democrats are clear what we believe in: an open, inclusive and tolerant nation that stands tall in the world and doesn't hide from it. We are not uncritical of the EU's institutions. Indeed as Liberals, we fiercely believe that power must be devolved to the lowest possible level, empowering communities and individuals wherever possible to make decisions for themselves. But we recognise that staying in Europe is the best way to find the solutions to the problems that don't stop at borders, rather than leaving them to our children and grandchildren. We believe Britain must put itself at the heart of our continent's future and shape a more effective and more accountable Europe, focused on responding to major global challenges we face.

Together in Europe we can build a strong and prosperous future, from pioneering research into life-saving new medicines to tackling climate change and fighting international crime. Together we can provide hope for the desperate and spread the peace we now take for granted to the rest of the world. And together we can show the world a generous, outward-facing Britain we can all be proud of. So if you agree then join the Liberal Democrat campaign today, to remain in together, and to stand up for the type of Britain you think we should be.