Our whole solar system is going through climate change, not just earth
Its a cycle
(1) Climate doesn't magically change. There is always a factor external to the climate system that forces it. Examples are changes in the sun, changes in the planet's orbit, changes in atmospheric composition etc.
(2) Suppose "climate is changing through out solar system" is true (we'll come to that), it only has bearing on earth's climate if the sun changes. Fact is the sun has not changed
in a meaningful way for the past few decades. This suggests that even if climate is changing everywhere, the causes are different
(3) "Climate is changing through out solar system" is a dubious statement.
(i) Claims that mars is warming is NOT (AFAIK) based on instrument, but images showing that ice caps shrunk. You can't even rule out a regional change, so claiming that Mars is warming questionable.
(ii) Claims of pluto warming is even more dubious. Pluto's orbit is 246 years long. Since it's discovery in 1930, pluto has made 1/3 of its orbit, so we can't be sure that it is not simply an effect of the orbit, i.e. a seasonal change. To put this into perspective, claiming that pluto's climate is changing is like claiming climate change on earth because May is warmer than January.
More interestingly, pluto is warming despite its distance to the sun is increasing (which normally entails cooling), and one explanation for that is the greenhouse gas effect due to methane
Summary: as the only climate driver (the sun) that is common to all planets has not undergone changes recently, even if other planets are undergoing climate changes, they will very likely be for different reasons.