In the year 1122, people from several northern European countries travelled through open seas in the Arctic.
Papers Past | VARIATIONS IN CLIMATE. (Press, 1887-11-08)
By contrast, the 1970’s were much colder with Iceland frozen in, global temperatures plummeting and scientists forecasting a new ice age.
TIME Magazine Archive Article — Another Ice Age? — Jun. 24, 1974
The 1990 IPCC report showed this warmth in the 12th century, and recognized that temperatures then were much warmer than they are now.
Reality didn’t suit the needs of government or climate scientists who need funding, so the 2001 IPCC report contained Michael Mann’s nonsensical hockey stick graph which shows ice melting when it is cold, and ice freezing when it is warm.
?www.meteo.psu.edu/holocene/public_html/shared/research/ONLINE-PREPRINTS/Millennium/mbh99.pdf
The basis of modern climate science is complete garbage and fake news. It appears that none of the key players have any understanding of basic science or physical law. It is the biggest scientific scam in history, and the people behind it need to be held accountable.