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Geoengineering promises to be exceptionally cheap, making it much more likely than expensive carbon cuts to be implemented. 

Recent developments, such as the Islamic State's use of dams to pressure downstream populations to surrender, have highlighted the need to protect water resources in conflict zones.

Democratically elected governments and parliaments install EU leaders and bureaucrats (and independent judges) precisely to place limits on the majority of the moment and future governments. 

Ethical machines would pose no threat to humanity. On the contrary, they would help us considerably, not just by working for us, but also by showing us how we need to behave if we are to survive as a species, writes Susan Leigh Anderson.