One theory that has been promulgated is that the next ice age will begin about the year 2030.  If the amount of particulate matter in the atmosphere — which has been well shown by historic events to lower, not increase temperatures — keeps increasing, who knows?

Arctic sea-ice volume was higher on June 1st than on the same date in 2011 and far, far higher than on the same date in 2012, 2016 and 2017. Now that the Arctic melt season has started in earnest, we find a surprising trend. Instead of shrinking rapidly — as is often claimed by global […]

via Arctic sea ice volume growing, not shrinking! — Iowa Climate Science Education