evidence: Sources: IPCC (1), WMO (4, 7, 10), WMO (4), IPCC (4, 7), UN Climate Action (8, 10), World Bank (11). [...] - Global surface temperature has increased faster since 1970 than in any other 50-year period over at least the last 2000 years. [...] Sources: UNICEF (1), WMO (2, 3, 6, 9), IPCC (4), FAO (5), UNEP (7), New Climate Economy Report (10).