Skeptics often times say that Mars and other planets are warming and that somehow explains why the Earth is warming. They suggest that humans cannot be the cause of global warming since we are not on those other planets.
However, other planets have radically different atmospheres and climates than ours and they get warmer and cooler for reasons that are not related to anything that is happening on Earth.
What Skeptics often times fail to mention is the supposed connection between these planets and the Earth. They imply, without stating it, that the sun which all our planets have in common is getting warmer. However, as the chart below shows, the sun has actually been cooling off in recent years.
Figure 1: Chart showing the cycles of the sun’s luminosity on a downward trend. Courtesy of Wood for Trees.