The Download: the fossil fuel elephant in the room, and better tests for endometriosis

The UN climate talks in Brazil avoided addressing fossil fuels, despite record-high emissions and temperatures. Meanwhile, new noninvasive tests for endometriosis are emerging to help speed up diagnosis and management of the condition. OpenAI denies responsibility for a teenager's death linked to its ChatGPT, and other tech news includes the CDC's new deputy director's views on vaccines and AI's potential impact on the workforce. Additionally, an Italian defense group has developed an AI-powered air shield system, and the EU is considering a ban on social media for under-16s.