Climate change and canards

At some recent forums one of the other candidates has been saying in authoritative tones,

"Global warming is probably being caused by factors other than human activity. For example, Mars is warming."

The word that came to my mind is one that's not used a lot and I wasn't 100% sure of it's meaning: CANARD. I looked it up and find I was right. A canard is "An unfounded or false, deliberately misleading story." The petroleum and coal industries never cease to try to defuse the criticism of their industry by supporting those who'll spread the word that we can go on living as usual. Here's a link to a place that gives all the facts about Mars warming as well as other FAQs: RealClimate.org

And here's what they say about Mars:

Globally, the mean temperature of the Martian atmosphere is particularly sensitive to the strength and duration of hemispheric dust storms. . . .

Thus inferring global warming from a 3 Martian year regional trend is unwarranted. The observed regional changes in south polar ice cover are almost certainly due to a regional climate transition, not a global phenomenon, and are demonstrably unrelated to external forcing. There is a slight irony in people rushing to claim that the glacier changes on Mars are a sure sign of global warming, while not being swayed by the much more persuasive analogous phenomena here on Earth…