What is the cycle we see and what is the cause of this cyclically of global temperatures and what does this say about a potential future glacial age?

In the last 450,000 years the earth has had at least 4 major ice age cycles .What is the cycle we see and what is the cause of this cyclically of global temperatures and what does this say about a potential future glacial age? 50 L — 40 a) 30 a) u, 20° 10′ Glacial-interglacial […]