Almost all proposals for what to do to stay under  2° Compare the energy needs now with the energy needs at the end of a transition process. What is not taken into account is the cost of the transition itself. The clue is the often  included language that this is a good business opportunity. The trouble is that the transition requires building new factories a new infrastructure and most of that will be done using old technologies, such as diesel trucks to move material from one place to another. Also many people will lose their current jobs and hopefully move to new ones, but those will not be in the same place which means relocation costs which takes money and energy. An actual transition would be very disruptive of the current economy and those costs are not being considered when Comparing the present with a new possibly preferred future state.