The ~30%/year growth in renewables generation capacity is a fantastic growth rate. That is a roughly 10x capacity increase every 9-10 years. It seems like it should be fast enough by itself to put us on a path to mitigating the worst effects of climate change. Is it fast enough?
This recent article says "no".
http://spectrum.ieee.org/energy/renewables/what-it-would-really-take-to-reverse-climate-change
The fast renewable growth rates won't get us to where we need to be - the pace needs to be faster and the only way to overcome the entrenched political fossil fuel interests is to make the costs of renewables so low and so easily integrated into daily demand cycles that there is no other logical choice to their use.
You could make a claim today that the generated costs are low enough, but the integrated costs are not low enough. The biggest future investments have to be made in lowering the integrated costs, and some disruptive, breakthrough technology is needed (and soon).
Additionally, if you crunch the numbers, the only way to prevent CO2 levels in the atmosphere beyond what the vast majority of scientists say will create major disruptions is to have technologies that will also remove existing C02 from the air and sequester it. Otherwise, even with massive cuts in additional emissions, C02 concentrations will continue increasing.
It reminds me very much of an article I read in a special issue of Scientific American about 10 years ago (and which, unfortunately, I have never been able to locate on-line). This article described carbon reduction strategies (go nuclear, high renewables, carbon sequestration, etc.) and analyzed which strategies would be needed to mitigate climate change, and the conclusion was "all of them".
We have a long way to go...it's not hopeless, but more of the same as we have today will not get us there.
This recent article says "no".
http://spectrum.ieee.org/energy/renewables/what-it-would-really-take-to-reverse-climate-change
The fast renewable growth rates won't get us to where we need to be - the pace needs to be faster and the only way to overcome the entrenched political fossil fuel interests is to make the costs of renewables so low and so easily integrated into daily demand cycles that there is no other logical choice to their use.
You could make a claim today that the generated costs are low enough, but the integrated costs are not low enough. The biggest future investments have to be made in lowering the integrated costs, and some disruptive, breakthrough technology is needed (and soon).
Additionally, if you crunch the numbers, the only way to prevent CO2 levels in the atmosphere beyond what the vast majority of scientists say will create major disruptions is to have technologies that will also remove existing C02 from the air and sequester it. Otherwise, even with massive cuts in additional emissions, C02 concentrations will continue increasing.
It reminds me very much of an article I read in a special issue of Scientific American about 10 years ago (and which, unfortunately, I have never been able to locate on-line). This article described carbon reduction strategies (go nuclear, high renewables, carbon sequestration, etc.) and analyzed which strategies would be needed to mitigate climate change, and the conclusion was "all of them".
We have a long way to go...it's not hopeless, but more of the same as we have today will not get us there.