What natural sources that cause climate change?

Question

What natural sources that cause climate change?

Answer 1

Sunspot activity and volcanic activity would be the best answers.  When the sun has a long period without any significant spots, a period of global cooling usually results (what is beginning to happen now since cycle 23 is so long in getting here).

Answer 2

Unfortunately, that's too complex of a question to answer effectively. There's old saying: "A butterfly flapping its wings in Japan can start a tornado in Texas." This is obviously an exaggeration, but it's essence behind a Physics philosophy called Chaos Theory (Which is a bit too complex to explain).

The answers said before me certainly factor into it, but it's often impossible to find a single cause behind climate change

But are you talking about weather-climate-change or global-warming-climate-change?