Most assessments of global warming use 1850-1900 as a baseline, but researchers have now established a new pre-industrial reference by using Antarctic ice cores to estimate the average temperature before 1700 Most assessments of global warming use 1850-1900 as a baseline, but researchers have now established a new pre-industrial reference by using Antarctic ice cores to estimate the average temperature before 1700 New Scientist – News
Humanity has warmed the planet by 1.5°C since 1700
