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It is ironic that Mr Bortz abhors geo-engineering as a temporary fix for our rapidly deteriorating planet, since it is man's pollution, primarily from the burning of fossil fuels, that is changing our planet to begin with.

There is a simple and cheap way to immediately cool down the Earth: just add a little sun dimming aerosol to the upper atmosphere. According the Dr James Lovelock, the alternative to geo-engineering is a massive cull of humans. On the other hand, again according to Dr Lovelock, we live in a "fool's climate," where the temperature should be much higher (2-3 degrees C!) except for our short-lived sun dimming pollution.

Ironic that Mr Bortz abhors deliberately adding a little more sun dimming aerosol when it is the sun dimming aerosol we already put into the air that is saving our civilization from destruction. By the way, it should come as no surprise that the worst effect of global warming will be record high summer temperatures. What isn't so obvious is that the world depends upon non-irrigated crops for the majority of our food. According to Dr Lovelock, on the current trajectory we can expect the routine failure of non-irrigated crops, resulting in mass migration and famine.

Maybe people are a little uneasy now about deliberately geo-engineering the Earth (even if they are doing it now with short-lived sun dimming aerosol), but I guarantee they will change their mind when mass famine hits by mid-century.