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Sunspot activity have been observed and recorded for at least 400 year.
"Yes, numbers of sunspots
can vary by that much [60%] or even more on an 11-year cycle, but the sun’s
output—the total amount of energy we get—is extremely stable and only
changes by about 0.1 percent, even in extreme sunspot cycles like the
one [recently predicted in 2030] . . .
Past research
suggests that an extreme decline in solar activity would lead to a
shift of just 0.16 degrees Celsius globally—and even that is erased once
a more typical solar cycle resumes in a few decades. . .
No matter what the sun does over the next century, we are not heading in to a new ice age. Why am I so sure about that? It may have something to do with the 110 million tons of carbon dioxide humanity is pumping into the atmosphere every single day. The resulting change to our global climate system is so huge, it overwhelms all natural atmospheric forces, including the sun. There is no other plausible explanation for global warming except us."
Read Slate, No, the Earth Is Not Heading for a "Mini Ice Age".
Read also, the Washington Post, News about an imminent 'mini ice age' is trending — but it’s not true.
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