“The sun is still the number 1 factor in our energy balance. No matter how much people argue about CO2, they can't successfully explain the pre industrial revolution 900-1300AD Medieval Warming Period or the cold 1645-1715 AD Maunder Sunspot Minimum that coincided with European crop failure, famine and disease while linking it with our modern day issues with CO2 to climate change. Yet sunspots and solar cycles can and do explain both.”