>Mainly the solar cycle.
Correct Anon is correct:
Modern Grand Solar Minimum will lead to terrestrial cooling
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7575229/
The Maunder minimum (1645–1715) was indeed a grand minimum: A reassessment of multiple datasets
https://www.aanda.org/articles/aa/full_html/2015/09/aa26652-15/aa26652-15.html
The Approaching New Grand Solar Minimum and Little Ice Age Climate Conditions
https://www.researchgate.net/publication/284205134_The_Approaching_New_Grand_Solar_Minimum_and_Little_Ice_Age_Climate_Conditions
Upcoming Grand Solar Minimum Could Wipe Out Global Warming for Decades
https://canadiancor.com/upcoming-grand-solar-minimum-could-wipe-out-global-warming-for-decades/