How do we know climate change is caused by humans

🤓Expand your scientific horizon on Brilliant! ➜ First 200 to use our link will get 20% off the annual premium subscription. In this video I summarize the main pieces of evidence that we have which show that climate change is caused by humans. This is most important that we know in which frequency range carbon dioxide absorbs light, we know that the carbon dioxide ratio in the atmosphere has been increasing, we know that the Ph-value of the oceans has been decreasing, the ratio of carbon isotopes in the atmosphere has been changing, and the stratosphere has been cooling, which was one of the key predictions of climate models from the 1960s. The quiz for this video is here: In this video I explain how the greenhouse effect work in much detail: 🤓 Check out our new quiz app ➜ 💌