I think your question, what will kill more people, is a red herring. Global poverty is not problem of access to cheap energy but rather a problem of political and social structure. Look at Russia, Saudi Arabia, or Nigeria. The economic gains from access to cheap oil has gone primarily to the elites while poverty still runs rampant. Meanwhile countries like Norway have used their oil wealth to tackle things like poverty and infrastructure. If you don’t understand how our lifestyles could be impacted by climate change then you haven’t been paying attention to the scientific literature. The people climate change will have the greatest impact on are those that live in cities, hence the developed world. We (urbanized societies) depend on the continued high productivity of agriculture and access to clean water. Climate change means that once productive agricultural regions will become less productive as weather patterns change, pests once killed by cold persist longer and move farther north, and water sources are reduced. Read the literature on agricultural productivity versus climate change. And that’s not even touching on all the smaller impacts like tropical diseases moving northward, more fires, more extreme weather events, etc. As for helping the impoverished world, I don’t think more drilling is going to make that happen. We have been drilling for a long time and it hasn’t been the case so far. I don’t see why it would change now. Also I reject your dichotomy that helping the impoverished world and dealing with climate change are mutually exclusive. People in underdeveloped regions aren’t going to see much benefit from extra oil extraction. There are no power lines to get the electricity to them, roads to get the diesel to their generators, etc. But they can benefit greatly from some turbines or solar panels because the extra infrastructure, and hence the political will to develop it, isn’t needed.