Cancel or clarify question on power plant emissions
There is a major problem with question #2, spring 2013: what percent of global carbon emissions come from coal fired power plants.
Currently approx. 40% of carbon comes from electricity generation, and 40% of electricity comes from power plants =>16%. But the answer choices suggest that the expected answer is 40%. The question needs to be clarified: relative to what % current value?? Else we are left guessing what the question means.
Adminmoderator (Admin, visionprize) commented
Vision Prize Research Team:
Thanks for pointing out this ambiguity. The question was intended to target the issue of whether the proportion of gross carbon emissions from coal-fired power plants will dramatically change and, if so, by how much. Specifically, what fraction of global emission of carbon will come from coal power plants, not all uses of coal. In retrospect, including an explicit reference to the current level would have been helpful. Given your feedback, we'll aim to do so in the future.