"In addition to the Martian ice caps getting smaller over time"

Martin ice caps shrink in summer, in some summers completely disappears, and grow in winter. There is not enough historical data to calculate any kind of trend.

"Pluto has also experienced some warming, as well as some of the frozen moons of Jupiter and Saturn (I forget which ones, but you can check for yourself)."

And the relation to global warming on Earth is ... ABSOLUTELY NONE!

Solar activity has remained constant (considering a solar cycle) and it is NOT an explanation for the increase in temperature on Earth.

On the contrary, CO2 is a gas with a well known and easily measured "green house" effect but, curiously, some people think that the CO2 produced by humans is some how different and does not cause that said effect.

How much of the warming is due to human activity is an open subject but affirming that all the CO2 we dump in the atmosphere has, some how, zero effect is ridiculous and the real hoax.