The latest evidence suggests that the Chinese scientific establishment understands the dangers of a planned Himalayan dam – the world's largest – more clearly than its political leadership is willing to acknowledge. With the livelihoods of two billion people at stake, the international community needs to weigh in. Oleh Brahma Chellaney

Youth activists demand a global ban on solar geoengineering, warning it’s a dangerous distraction from real climate solutions and a generational betrayal. Oleh Mohammed Usrof, Disha Ravi, Heleen Bruggink dan Erica Njuguna

Such technologies appeal to those who repudiate the need for transformative societal change to limit global warming and could become a dangerous distraction, especially as it gains traction as a delay tactic for the fossil fuel industry. Oleh Yacob Mulugetta, Dean Bhekumuzi Bhebhe dan Niclas Hällström

The areas most prone to sinking are megacities that house almost 20 per cent of the global urban population, and these areas are also the most heavily impacted by sea-level rise. Oleh Katherine Dafforn