The evidence supports the effect of Sunspot activity on the Earth's climate, but that is only one of many areas that effects us on Earth. On March 13,1989 a large Sunspot ignited powerful flares that tripped the circuit breakers a generator station. The started the collapse of the Quebec power system and left people without power for hours to days. These same flares damaged several man made satellites, and caused smaller outages all over the U.S and Canada. There are countless other times when large Sunspots have effected similar damage to various electrical systems on Earth.
Sunspots can even effect nature.
There is now evidence that the Sunspot cycle has a direct relation to the swings in population of the Snowshoe Hare in Canada. Researchers spent 18 years studying all the causes of population increase and decrease. They added more food to the environment, and kept away predators from selected areas. The population still increased or decreased relative to the Sunspot cycle. Although there is no sure way to prove this theory, it seems likely that there is some kind of biological clock that ticks to the beat of the Sunspot cycle and maintains this population swing.