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The present nearly exponential growth of the cumulative installation power of wind and photovoltaic power plants is very promising in the context of a rapid reduction of the emission of CO2, which can lead to a swift mitigation climate change if this growth behavior is maintained in the future. In this review we identify a set of ten limiting factors that can restrain, or halt back, an exponential growth of these variable renewable power plants (VREs) in the future. If the exponential growth slows down to a linear growth, such a case would extent considerably the time to reduce the CO2 emissions and the related mitigation of climate change. A scenario that would result to a much higher risk of a future continuation of the economic grow and thrive of the global economy and human society. We argue that if these limiting factors are adequately addressed to an exponential expansion VRE power plants is feasible and can result in the nearly complete avoidance of CO2 emissions as related to energy generation and consumption in 2030.

We hypothesize that the present expansion of energy generation by variable renewable energy (VRE) power plants, such as wind and photovoltaic power plants, leads to a 100% renewable energy supply in 2030 because of its inherent exponential growth function. This behavior is related to the exponential cost reduction of its generated energy and the nearly unconstrained available potential of its natural resources. The cost reduction results from the continuous improvements in development, research, manufacturing, and installation, also showing a growth of its installation power per power plant or aero generator. We prove that if the historic exponential growth is followed in the future, it is possible to decarbonize the world's electric energy systems' power supply in 2026. Furthermore, the global demand on primary energy can be supplied in 2030, which leads to the total suppression of CO2 emissions related to the energy need of humanity. Because of the related cost reduction, energy costs are not anymore relevant. Our extrapolation is based on the continuation of the historic growth functions of the globally installed PV and the wind power plants, and we also discuss the conditions necessary to enable a transition to such a 100% renewable energy production. Considering a non-constrained growth of VRE power plants' installation power, decarbonization related to energy generation and use can be accomplished in a much shorter time frame as previously scheduled. As a result, climate change mitigation, energy cost reduction, and high employment are attained much earlier than previously planned.