Science Weekly Folgen

On 15 November the world’s population reached 8 billion, according to the UN. Much of that growth is because we’re living longer. As a species we will continue to age, but eventually stop growing. The UN predicts that in the next century humanity will begin to go into decline. So what happens when societies get older and smaller – a problem some countries are already encountering? Ian Sample speaks to Prof Vegard Skirbekk about how humanity got here, and how we prepare for future demographic change. Help support our independent journalism at theguardian.com/sciencepod

It’s supposed to be the first ever carbon neutral World Cup. Organisers Fifa and host Qatar say they have implemented sustainability initiatives, taken measures to limit carbon output and will offset greenhouse gas emissions by purchasing credits. Fifa has admitted, however, that the tournament’s carbon footprint will bigger than any of its predecessors, and experts believe emissions have been underestimated, calling into question the claim of carbon neutrality. Madeleine Finlay speaks to sports reporter Paul MacInnes about the environmental burden of building stadiums, flying in players and fans from around the world and keeping the pitches green, and asks whether football is really ready to face up to its carbon footprint. Help support our independent journalism at theguardian.com/sciencepod

A year ago at Cop26, global environment editor Jonathan Watts caught up with two climate scientists to hear what they thought about the progress made. A lot has happened in the intervening 12 months, and the world hasn’t stayed on track with its previous promises and pledges. Global carbon dioxide emissions from fossil fuels are expected to increase by 1% in 2022, hitting 37.5 billion tonnes – a record high. Ian Sample called them both up to find out how they’re feeling now. Speaking to Prof Peter Stott, Ian asks whether the 1.5C goal is still alive, and questions Katharine Hayhoe on how she stays hopeful. Help support our independent journalism at theguardian.com/sciencepod