At any given time you have a rate of capital expenditure you are willing to devote to the crisis. Some fraction of this maxes out production capacity of wind an

At any given time you have a rate of capital expenditure you are willing to devote to the crisis. Some fraction of this maxes out production capacity of wind and solar energy equipment. The rest is spent on something else. It can be dumped on building individual nukes, or invested to expand wind, solar, storage, and fuel synthesis equipment production. Only one of those choices feeds an exponentially increasing capacity to respond to the crisis.