Vorläufiger Klima-Bericht der Weltorganisation für Meteorologie, 29.11.2018 (engl. Originalfassung)
Global mean temperature for the period January to October 2018 was 0.98±0.12°C above the pre-industrial baseline (1850-1900. The estimate comprises five independently maintained global temperature data sets and the range represents the spread of the data sets. 2018 is on course to be the 4th warmest year on record. This would mean that the past four years - 2015, 2016, 2017 and 2018 –are also the four warmest years in the series. 2018 is
the coolest of the four. In contrast to the two warmest years, 2018 began with weak La Niña conditions, typically associated with lower global temperatures. The 20 warmest years have all occurred in the past 22 years.
Increasing levels of the greenhouse gases in the atmosphere are key drivers of climate change and atmospheric concentrations reflect a balance between emissions due to human activities and the net uptake by the biosphere and oceans. In 2017, greenhouse gas concentrations reached new highs, with CO2 at 405.5±0.1 parts per million (ppm), CH4 at 1859±2 parts per billion (ppb) and N2O at 329.9±0.1 ppb. These values constitute, respectively, 146%, 257% and 122% of pre-industrial levels (before 1750). Global average figures for 2018 will not be available until late 2019, but real-time data from a number of specific locations, including Mauna Loa (Hawaii) and Cape Grim (Tasmania) indicate that levels of CO2, CH4 and N2O continued to increase in 2018.
Den vorläufigen Bericht finden Sie hier.