Alastair,
I believe we can produce more than 100% from renewables, and actually
go carbon negative by doing sequestration at the same time, that is
actively taking carbon out of the air again.
In fact I think we could get there very fast indeed (years, not decades
or a century) given the right level of effort and willingness to do
without. I just don't think that world society is giving this the
required level of attention (WWII in the US or Soviet Union type of
attention) to make it happen, because, rhetoric aside, climate change
is actually not widely seen as that urgent or threatening.
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