Concrete is the most widely used substance on earth after water. It’s quite literally the foundation of the modern world, and no wonder - it’s strong, cheap, and mouldable into nearly any shape.
But these benefits come at a cost: concrete production is responsible for around 8% of global CO2 emissions - that’s around three times more than the aviation indus ... Show More
Aug 15
How long does light last?
When listener Rob from Devon, UK, heard of a newly detected planet light years away, he was struck by the sheer scale the light must travel to reach us here on Earth. It got him wondering: How long does light last? What’s the oldest light we’ve ever observed? And does light ever ... Show More
26m 29s
Aug 8
Can we stop the rain?
CrowdScience listener Rit, from Pune in India, is staring out of his window at the falling rain. It’s been pouring for four days now, and shows no sign of stopping. The laundry is piling up, all his shoes are wet, and he’s worried about the effect it’s having on the environment, ... Show More
32m 21s
Jan 2021
How we could make carbon-negative concrete | Tom Schuler
Concrete is all around us: we use it to build our roads, buildings, bridges and much more. Yet over the last 2,000 years, the art of mixing cement and using it to bind concrete hasn't changed very much -- and it remains one of the world's biggest emitters of carbon. Entrepreneur ... Show More
5m 16s
Apr 2021
The material that could change the world... for a third time | TED-Ed
Today roads, sidewalks, bridges, and skyscrapers are made of a material called concrete. There's three tons of it for every person on Earth. It's also played a surprisingly large role in rising global temperatures over the last century. So, what exactly makes concrete problematic ... Show More
5m 43s
Jun 2022
Does recycling help fight climate change?
Reduce, reuse, recycle is a familiar mantra the world over. Recycling has been described as ‘one of the easier climate-friendly acts” that individuals can do. A recent poll found that, globally, most of us believe that recycling is the single best thing we can do to tackle the cl ... Show More
27m 23s
Jan 2021
Recycling! Is it BS?
The recycling bin — many of us have learned to view this humble container as an environmental superhero. It is, after all, the critical first step in turning our trash into… well, not treasure, but at least more stuff. Or is it? In this episode, we take a look at the science, hel ... Show More
48m 46s