Table 1 Percentage correct and confidence in judgements for the true/false statements

From: The accuracy of German citizens’ confidence in their climate change knowledge

Knowledge domain Statement (true/false) Percentage correct verifications for citizens (scientists) Confidence judgement of citizens (scientists)
State (1) The global average temperature in the air has increased approx. 3.1 °C in the past 100 years. (False) 32.6% (82%) M = 0.71, s.d. = 0.16 (M = 0.88, s.d. = 0.15)
(7) The 1990s was the warmest decade during the past 100 years. (False) 54.4% (65%) M = 0.67, s.d. = 0.17 (M = 0.85, s.d. = 0.14)
(2) The global change in temperature in the past 100 years is the largest during the past 1,000 years. (True) 62.1% (88%) M = 0.71, s.d. = 0.17 (M = 0.89, s.d. = 0.12)
Causes (8) Climate change is mainly caused by a natural variation in sunbeam and volcanic eruption. (False) 80% (97%) M = 0.74, s.d. = 0.18 (M = 0.96, s.d. = 0.10)
(3) Carbon dioxide concentration in the atmosphere has increased more than 30% during the past 250 years. (True) 70.5% (94%) M = 0.69, s.d. = 0.17 (M = 0.92, s.d. = 0.12)
(4) The increase of greenhouse gases is mainly caused by human activities. (True) 84.1% (99%) M = 0.78, s.d. = 0.16 (M = 0.98, s.d. = 0.05)
Consequences (9) The blanket of snow in the Northern Hemisphere has decreased approximately 10% since the 1960s. (True) 77% (80%) M = 0.72, s.d. = 0.17 (M = 0.72, s.d. = 0.16)
(6) An increasing amount of greenhouse gases increases the risk of more UV-radiation and therefore a larger risk of skin cancer. (False) 24.2% (81%) M = 0.75, s.d. = 0.18 (M = 0.83, s.d. = 0.16)
(5) In 100 years from now, sea level will rise approximately one metre.a
  1. Statements are numbered according to question number. Percentage correct refers to number-right scoring. Numbers in brackets indicate values for scientists.
  2. aStatement was not included in the analyses as its veracity can be considered unclear with respect to the 2014 IPCC report.