B.1.1. Evidence from attributed changes in some climate and weather extremes for a global warming of about 0.5C supports the assessment that an additional 0.5C of warming compared to present is associated with further detectable changes in these extremes (medium confidence). Several regional changes in climate are assessed to occur with global warming up to 1.5C compared to pre-industrial levels, including warming of extreme temperatures in many regions (high confidence), increases in frequency, intensity, and/or amount of heavy precipitation in several regions (high confidence), and an increase in intensity or frequency of droughts in some regions (medium confidence). 3.2, 3.3.1, 3.3.2, 3.3.3, 3.3.4, Table 3.2