In the mini ice age that took place between 1645 and 1715, a
period known as the Maunder minimum, temperatures dropped globally by 1.3
degrees Celsius, leading to shorter seasons and food shortage. The double
dynamo model predicts a 60% drop in solar emissions, and this could well
account for the 10 degrees Celsius drop in temperatures of the ice-age. This
drop should start in the 2030-2040 solar cycle. The sharp reduction in
temperatures will increase snow and ice formations which will reflect the heat
of the Sun (albedo) further reducing temperatures.
The Vital Needs Theory - page 96