Melissa Hanham of the One Earth Future foundation pointed out that adversaries would have no way of knowing if a full-force Trident was being fired at them, or its low-yield cousin.

Melissa Hanham shard her insights on the issue to estimate the power of nuclear weapons.

Melissa Hanham, an expert on weapons of mass destruction at the One Earth Future foundation, said that any idea that missile defence could limit the damage of a nuclear war was “fantasy”. “If we invest as much money in lowering tensions and de-alerting missile systems, we would be safer by far,” Han...