Until recently, the Earth was in a natural cooling phase, which started around 5 thousand years ago . This cooling was heading towards a new ice age, due in about 1.5 thousand years . However, after around 1850 , global temperatures started to rise dramatically [4,5].
For the past 250 years, humans have been releasing greenhouse gases into the atmosphere , causing the Earth to warm by roughly 1.1°C  when it should be cooling !
 https://science.sciencemag.org/content/339/6124/1198/tab-pdf (Page 1201 Paragraph 1 and Figure 1b)
 https://www.nature.com/articles/ngeo1358 (abstract)
 https://earthobservatory.nasa.gov/features/GlobalWarming/page3.php (Second image)
 https://earthobservatory.nasa.gov/features/GlobalWarming/page2.php (Paragraph 3)
 https://science.sciencemag.org/content/339/6124/1198/tab-pdf (Paragraph 1)
 https://earthobservatory.nasa.gov/features/GlobalWarming/page2.php (The enhanced greenhouse effect Paragraph 1)
 https://library.wmo.int/doc_num.php?explnum_id=9936 (Temperature Paragraph 1)
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