The results cited by Lomborg (2015) are almost entirely due to the assumptions he makes about the post-2030 annual emissions from the United States, European Union and China. In each of these cases, annual emissions are assumed not to reduce any further, and in most cases, to rise.
Lomborg, B. (2015) ‘Impact of Current Climate Proposals’, Global Policy, 7 (1), pp. 109–118. DOI: 10.1111/1758-5899.12295.