Implications of delayed participation and technology failure for the feasibility, costs, and likelihood of staying below temperature targets—Greenhouse gas mitigation scenarios for the 21st century

The feasibility of limiting greenhouse gas concentrations and associated global mean temperature increase to 2 °C above preindustrial levels has recently attracted considerable scientific and policy attention. Whether or not such low targets can be achieved in the long-term depends on a number of assumptions about, for instance, technological change and the willingness of countries to immediately join a post-Kyoto agreement to limit...