Let’s look at our most recent past. For 150 years cosmic radiation was decreasing and that caused global warming. During the time the Earth was warming there was a 9 percent decrease in cosmic ray intensity. Why? Nominally, it’s the Sun, stupid. It was the continuous increase in solar activity over the last 150 years that shielded the Earth from cosmic rays.
An active Sun caused the decrease in cosmic ray intensity. A more active Sun meant fewer cloud-causing charged particles. This relationship that cosmic rays cause clouds is real: it isn’t a theory at all—it has been demonstrated in controlled scientific experiments in laboratories right here on Earth.
Let’s follow the logic. Less cosmic ray intensity results in less cloud cover. Less cloud cover reduces the Earth’s albedo. The effect of that is less solar radiation being reflected away back into the space and that is what causes the temperature of the Earth’s surface to rise. Consequently, more heat is stored in the oceans, the rivers and lakes and in clays below the Earth’s surface.
What happens to that stored heat? Eventually all of the stored heat is given back to the atmosphere when the climate changes and swings back to a global cooling trend. And, that is the trend we have now. The Sun has been anomalously quiet for a while now. With a less active Sun there has been an increase in cosmic radiation, causing more low clouds, leading to an increase in the Earth’s albedo, and that is reflecting away of more solar radiation. Consequently, the oceans are now giving up their heat; and, the oceans have been cooling for more than a decade.