Climate policy needs to take into account the costs of draconian measures, which are enormous.
Over the past two centuries, global life quality has dramatically improved, to a large extent because of an incredible increase in energy, mostly from the harnessing of fossil fuels. That has made agriculture, industry and transportation vastly more productive. Average life spans have more than doubled, hunger has dramatically declined, and real income has increased tenfold. We risk all that progress if we just stop using fossil fuels.
The world still gets four-fifths of its energy from fossil fuels, because renewable sources rarely provide good alternatives. Half the world’s population entirely depends on food grown with synthetic fertilizer produced almost entirely by natural gas. If we rapidly ceased using fossil fuels, four billion people would suddenly be without food.