The most recent report of the IPCC Working Group II (Impacts, Adaptation and Vulnerability) - Fifth Assessment) doesn't take such an alarmist view.
Executive Summary
This chapter assesses the implications of climate change on economic activity in key economic sectors and services, on economic welfare, and on economic development.
For most economic sectors, the impact of climate change will be small relative to the impacts of other drivers (medium evidence, high agreement). Changes in population, age, income, technology, relative prices, lifestyle, regulation, governance, and many other aspects of socioeconomic development will have an impact on the supply and demand of economic goods and services that is large relative to the impact of climate change. {10.10}
ipcc-wg2.gov |