Antalya, 2.8 °C, Venetian salt marshes: how much do you know about this week's COP31 climate news?

Seven questions from the latest climate news: from COP31 in Türkiye through the UN report and El Niño to Delhi's smog. How well do you keep up?

1. In which Turkish city is the COP31 UN climate summit being held?
2. According to the UN's 21 October report, how much warming is expected by 2100 without action?
3. What are the Venetian lagoon's "barene", which store carbon dioxide even better than land forests?
4. An analysis combining how many scientific publications found that noise pollution harms whole ecosystems?
5. Which ocean's warming waters are behind the 2026–27 El Niño?
6. What worsened the dangerously high air pollution in New Delhi on Monday?
7. Roughly how many civil organisations sent a comprehensive climate-law proposal to the Hungarian government?