Also, the statement "That period coincided with a little ice age on Earth that lasted from 1650 to 1700" is inaccurate. Actually, the period from 1650 to 1700 is not for the little ice age, but for the Maunder Minimum, the previous period when there were few sunspots. The little ice age has no sharp beginning, and is variously said to start almost anywhere after the medieval warm period - say anywhere from mid-14th century to the mid-17th century. The little ice age ended with the beginning of global warming in the mid-19th century.