@GeofCox I must respectfully disagree. It makes absolutely no difference at all what the "mix" is - ALL the models are doomed. Our entire hydrocarbon-fuelled #technological, so-called #civilisation is doomed - just like all it predecessors since the Neolithic. We can make that process more, or less, painful - but it is inevitable, & - in historical terms - relatively imminent. It won't last much beyond 2050, if then.