Our environment links us all: and we know that we are doing immense harm to that natural environment with our human activities. But where are the weak links? What are the potential pitfalls for the natural world, and for civilisation? In other words - if we don't change our ways - what could happen? This is a simply huge topic. So, for the sake of clarity, I’m going to split the ecological and environmental catastrophe into two parts. The first will focus on pollution, species extinction, and scarcity of resources – what you might call a general ecological collapse. The second part is going to focus on perhaps the most famous environmental problem we have: climate change.  We'll start by talking about biodiversity - what does it mean for us and for the planet that biodiversity is in decline due to human activities? We'll also talk about some of the lesser-spotted environmental crises - topsoil degradation and the infamous disappearance of the bees amongst them. Remember; if you enjoy the show, please tell others about it. You can visit the website at www.physicspodcast.com and you can find links there to support us via Patreon or Paypal, both of which will allow you to download bonus episodes at low, low prices.