We might consider this: balloons of sulphur – about the size of basket blimps tethered at fairs – balloons of burning particles sent into the stratosphere – or even this: fixed artillery firing sulphur from the surface – I’m deadly serious – sulphur to reflect the sunlight, to cool the climate, to give us time. We could even try it with a trillion wisp-thin mirrors. Or we might want to start a nuclear winter – we’d do this by releasing particles of soot – this is actually the cheaper option, and less messy. You don’t believe me. Well I’m deadly serious – this is where we are. This we must consider.