Most animals would go berserk or drop down dead with fright if you chase them around in a helicopter! The price they pay for this compliance is that in the minutes it takes to complete one orbit of the planet, , of them will be slaughtered for food. But if you think the scale in which we grow our food is absurd, just degrees westward takes us on to whole new level. The city of Las Vegas. Las Vegas breaks all the rules on where to build a city. A temple to gambling and entertainment, it sits slap-bang in the middle of a desert on the road to nowhere. And just like on board the space station, everything has to be shipped in. Every ounce of flour, every chocolate biscuit and every slice of bacon has to be brought in. Meanwhile, every minutes Las Vegas uses BBC - Three Counties Radio litres of water. That is the equivalent of , articulated tankers. With all the vast expense and effort to keep the city fed, Las Vegas also manages to be one of the fattest places in America. Almost two-thirds of the Las Vegas population are overweight. BBC - Three Counties Radio And it's not just the city's waistline that's expanding. Its population has almost doubled since , and it's a trend we're seeing across the world. It's estimated that by , there will be nine billion people on the planet and that is going to stretch the resources we have to produce food, to distribute food, and to ensure everybody has enough. I think if we are to address that challenge, we really have to look at how we balance the personal freedoms and choice we value so much around food with our responsibilities to live within our environmental limits. What's absolutely clear is that if we are to feed nine billion people by , we cannot continue eating the way we eat in Britain or indeed the United States today. Unhappily, there's no sign of us giving up on our appetite for ever more and ever faster food. Every minutes, two million hamburgers are eaten across the world. Back up on the space station, the cuisine is surprisingly cosmopolitan. I think it's the same thing. - No hamburgers here. - Genuine Russian food. Nice, ketchup. International food here on the International Space Station! We got yakitori, we got Russian chicken with rice there. - I have a pork chop. - Pork chop! - Oh, that's good, that's good. - That's good. - Yeah. This is the way to eat - on top of the world! It is essential astronauts keep fit and healthy to combat the effects of microgravity. When you put someone in space, space is a fairly hostile environment because of the microgravity - that has various effects on one's body. The calcium in our bones starts to leach out because our bones aren't loaded any more and the calcium starts to leach out - it's effectively osteoporosis. But it happens much quicker in space. So trying to find ways to stop that from happening, the astronauts must do additional exercise - resistance exercises. We can learn from their experience and then transfer that back here to Earth. Astronauts have to spend two hours every day exercising to keep in shape. In space, we appreciate just how precious our bodies are. It gives us a global perspective on our health. It's not just about how much we consume, it's also what we're throwing away. Eight minutes on, and we're swinging out beyond the United Kingdom, towards the islands of Hawaii. , miles off the coast of BBC - Three Counties Radio lies Hawaii, the most isolated population on Earth. Here there are sun-kissed beaches, wonderful surf, exotic wildlife and dramatic, volcanic landscapes.