1. The percentages refer to potential annual daylight hours when workers slow down or take more rest due to the rising heat, leading to health and productivity issues.

2. These are preliminary and indicative results for a selection of countries based on model data in an IPCC analysis. An updated analysis is due in 2016. The data is based on a working intensity of 300 watts, which is a reasonable mid-point level for a variety of jobs in agriculture, industry and construction. The share work capacity losses at very intense physical work (400 W) would be twice as high as the numbers in the table.