Correction to: Nature https://doi.org/10.1038/s41586-018-0577-1, published online 10 October 2018.

In this Letter, referring to reductions in greenhouse gas emissions in the European Union by 2030, the statement “About 75% of this reduction is expected to come from emission reductions and the remaining 25% from land use, land-use change and forestry” that cited ref. 7 of the original Letter (ref. 1 below) was incorrect. In fact, the 25% value in ref. 1 refers to global reductions, not those in the European Union. The correct value for the European Union is 1% (ref. 1), and the text has been corrected accordingly ('75%' has been changed to '99%' as well). We thank G. Grassi for identifying the error. Additionally, there were two other minor errors. First, in the sentence “The carbon-sink-maximizing portfolio has a small negative effect on annual precipitation (−2 mm) and no effect on air temperature (Table 1)” the word ‘precipitation’ was omitted. Second, Denmark was accidentally deleted during the conversion of Fig. 1. These errors have been corrected online.