There is not a single fact, figure or observation that leads us to conclude that the world‘s climate is in any way ‘disturbed‘. It is variable, as it has always been, but rather less so now than during certain periods or geological eras. Modern methods are far from being able to accurately measure the planet‘s global temperature even today, so measurements made 50 or 100 years ago are even less reliable.
Read more from extract-from-2015-french-global-warming-whitepaper which is itself an extract from a much more comprehensive paper here: http://www.scmsa.eu/archives/SCM_RC_2015_08_24_EN.pdf