Big Ideas

Questioning whether travel is ethical is probably the last thing on your mind when you decide to go on holiday. But for increasing number of travellers, 'ethical travel' is the preferred mode for tourists who don't want their holiday to just be an extractive exercise. So what are the ethical obligations for those who have the privilege to travel? And what does ethical travel mean in practice… ?

Would you eat protein brewed in a vat from bacteria instead of meat? "Nom nom nom!", you might say. George Monbiot probably agrees. One of the most influential thinkers on the future of of the planet, now he's interrogating what's on our dinner plate, and the staggering business of how it got there. He joins Natasha Mitchell to discuss his provocative book, Regenesis: how to feed the world without devouring the planet. And it all comes down to connecting with the Tolkienesque world beneath your feet.

The planet's hotter than it has ever been. July was the Earth's hottest month ever recorded since records began. And the consequences of this warming is increasingly becoming too hard to bear — particularly among those who don't have access to climate control. So what happens to our bodies in times of heat extremes? And what will happen when these extremes become the new 'normal'? It's something the veteran environmental reporter Jeff Goodell explores in his new book Heat: Life and Death on a Scorched Planet.

If you can't control it – then don't worry about it. It's one of the core messages of stoicism. Much easier said than done. But if you manage it, it can make your life a lot happier and calmer. That's not to say you should sit back and ignore injustice. The stoics have an answer for that as well. On Big Ideas, you'll hear about the ancient philosophy of stoicism and how to apply its principles to modern life. War, climate change, pandemic and endless social media platforms onto with you can project and amplify your anxieties. It seems like we all can use a good helping of stoicism.

For more than 100 years, birdwatchers have searched for evidence that one of Australia's rarest native birds is not extinct. And they might be a step closer to solving the mystery of the Buff-breasted Button Quail. It lives in the humid savannas of Cape York. And we know that this habitat is changing. If we want to have any chance of finding and even saving this bird, we have to act quickly.

We make machines, but do our machines also make us? And who's in control really? Superstar anthropologist, technologist, futurist, cyberneticist, and Silicon Valley insider Genevieve Bell joins Natasha Mitchell with young cybernetic creatives Hannah Feldman, Matt Heffernan, Ben Swift,   to talk machines, minds, messing with the code and what it would take to make technology and the world better.

Movie or TV roles for older women accurately reflecting contemporary, society and experiences are rare. Sigrid Thornton, Rachael Maza, Sophie Hyde and Anousha Zarkesh are asking: Why is that? After decades honing their craft in the industry, older actresses are more talented than ever before, more confident and more attuned to the camera. But cinema is obsessed with the young.

Who doesn't dream of being loved dangerously, thrillingly free from the tethers of restraint? It's a question journalist and author Kate Legge asked after the discovery of her husband's affairs. He was a high-powered media CEO, and she was a veteran journalist who was assured the infidelity was singular (more were to be discovered on the home PC). Having tried (and failed) to keep the marriage going, Kate started to write about it, only to discover infidelities spanning four generations on his side of the family. The resulting book, Infidelity and Other Affairs asks why some choose restraint, while others choose wild abandon.

Harvard University has been running the world's longest study into happiness. The Harvard Study of Adult Development has been running since 1938, and in that time of researchers have observed how Americans experience and understand happiness, and how that's changed over time. In an address for the UNSW Centre for Ideas, the study's fourth director, Robert Waldinger, reveals the study's largest findings, and how technology — and changes in society — have inflected the interpretation of the study's data.

Who sets the agenda when it comes to designing houses? More often than not wealthy developers call the shots. The result is cheaply-made hot boxes, unaffordable to live in, and poorly designed for human habitation. How did it come to this, and how can citizens and architects seize control? Meet 3 international trailblazers who want to change who controls what we get to call home — including an architect from Barcelona who needed an affordable place to call home and had social change on their mind.