I'm sure it's human-caused...

Astronomers "spot" global warming... on Jupiter...

For about 300 years Jupiter's banded atmosphere has shown a remarkable feature to telescopic viewers, a large swirling storm system known as The Great Red Spot. In 2006, another red storm system appeared, actually seen to form as smaller whitish oval-shaped storms merged and then developed the curious reddish hue. Now, Jupiter has a third red spot, again produced from a smaller whitish storm. Jupiter's recent outbreak of red spots is likely related to large scale climate change as the gas giant planet is getting warmer near the equator.

Now, let's see... Earth is getting warmer, and farther out in the solar system so is Jupiter. I'm sure the carbon footprint of those handful of NASA probes are to blame for the current Jovian warm spell. After all, everyone knows temperature changes on a global scale can only be caused by us wee humans. Why, you could call even anthropomorphic global warming an article of... faith...