The phrase "grand minimum" refers to a period of time where the sun becomes less active than usual, resulting in a decrease in solar activity, such as sunspots. Full definition
This could be our first properly observed grand minimum, there are bound to be strange occurrences. (landscheidt.info)
This answer is explored in a new paper On the Effect of a New Grand Minimum of Solar Activity on the Future Climate on Earth (Feulner & Rahmstorf 2010). (skepticalscience.com)
One other factor in play is whether «Wilson's Law» will contribute to future grand minima, by 2190 I predict we will know the mechanics of this law. (landscheidt.info)