The recent IPCC SR15 Report has garnered a lot of press coverage because it warns that we must dramatically reduce CO2 emissions by the year 2030, less than 12 years away.
Global net anthropogenic CO2 emissions [must] decline by about 45% from 2010 levels by 2030 (40–60% interquartile range), reaching net zero around 2050 (2045–2055 interquartile range).
I would like to know which of the well-known and scalable emission mitigation strategies are still viable on such a short timeframe. Specifically, I am looking for answers in two categories:
1) Which emission mitigation strategies, if any, are unlikely to produce a net reduction in emissions within the 12 year timeframe? For example, early solar photovoltaic panels had an energy payback as high as 20 years, which would have made them non-viable on a 12 year timeframe. (Modern PV panels have a much faster payback, closer to 2 years.)
2) Which emission mitigation strategies, if any, are likely to cause a net reduction in emissions of greater than 45% within 12 years? In order to hit our target of 45% reduction by 2030 we will need a mix of techniques and technologies with varying payback. Which solutions are able to beat the target in this short timeframe?