Your motte and bailey arguments on global warming are not the way to approach this. Global warming is not the phrase used in nomenclature anymore, it is climate change because the worry is that humans are throwing the climate out of stability. However, where true disagreement occurs from those arguing against climate change is the level of impact humans have on the climate. The various models have to make a determination on the feedback loop of carbon dioxide into the overall earth system; it varies from model to model. This leads to the issue which an honest debate can be had: If anthropogenic climate change is occurring that will cause real damage to the planet, what is the range to adjust to and what should be done about it? If you believe strongly that the damage is occurring, would you be willing to wage war on countries who disregard the globe's needs and bring them to heel for their non compliance? China is throwing out massive amounts of air pollutants, getting them to compliance means shutting down the electrical means of them bringing themselves out of poverty.