 Lawson then examines how much warming will occur and what are the practical consequences over the next hundred years, based on the 2007 IPCC Report (AR4) scenarios and policy recommendations.The next issue analyzed is the importance of adaptation, what he claims is the IPPC’s most serious flaw regarding the impact of global warming, as there is a "systematic underestimation of the benefits of adaptation" and "the most cost-effective way of addressing the likely consequences" as opposed to reducing CO2 emissions.His next criticism regards the Stern Review, which he claims is "at the extreme end of the alarmist camp".