"anything related to energy that has a climate impact should not be measured in dollars, but in co2 equivalent..." It depends on what you're trying to do with

"anything related to energy that has a climate impact should not be measured in dollars, but in co2 equivalent..." It depends on what you're trying to do with the data. If you're trying to estimate the economic competitiveness, then $ is absolutely the metric more likely to in fact be a predictor of that. For example, will renewables continue to get market share, or is that in danger of being held back by battery cost? If battery cost is falling exponentially, we're in good shape. If battery cost is _not_ falling exponentially, then it could be that we need to explore alternative ways to store the energy. Whether or not $ _should_ be the driving factor, the reality is that it _is_ the better predictor of market uptake.