Reducing CO2 emissions to zero will not save the world. We will also have to extract it on a large scale from the atmosphere. Such an undertaking will require a global effort, the most ambitious in human history. Over the past several centuries, mining, quarrying, burning, drilling, pumping, metallurgy, lighting, aviation, and manufacturing have injected 2.4 trillion tons of carbon dioxide into the Earth's atmosphere. That's as many annual emissions as 522 billion cars, or 65 vehicles per person living in the world today. In a deserted, moonlit valley 30 km from Reykjavík, Iceland, Edda Aradóttir is determined to send this carbon dioxide (CO ₂ ) back to where he came from. Currently, the quantities processed are modest, but will increase significantly in the coming years. By re-injecting CO ₂ into the subsoil, a scientist is trying to reverse one of the actions that has most disrupted human history: the extraction of a phenomenal amount of underground carbon in the form of fossil fuels, which was the engine of modern civilization and today will become its scourge. He lacks time, like all of us. Extreme weather events and unprecedented temperature peaks associated with climate change are already here. And they will definitely get worse. (SAM HOWE VERHOVEK)