Here's what we have evidence of. Earth receives the majority of it's energy from the Sun. The Sun has significant fluctuations. Earth is affected not only by infrared & visible EM, but also by higher frequencies of EM. Earth is also affected by magnetism from the Sun. Earth's Magnetosphere is affected by the Heliosphere. A weaker Magnetosphere means less protection from Cosmic Rays, Coronal Holes, CMEs, & other space weather. Cosmic Rays perturbs water, seeds clouds, induces volcanic eruptions & earthquakes. Volcanic ash & cloud cover increase albedo, which cools the earth.
The "year without a summer" in 1816 (~200 years ago), was caused by the Mt. Tambora eruption. The Carrington Event happened in 1859.