The gist of the article is that the apparent lack of carbonates suggests that Mars never had standing bodies of water, and that the ice on the planet has likely been frozen for most of the planet's history.
It is noted that "scientists have found that realistic climate models do not generate that much global warming on Mars." My guess is that some of the same assumptions go into climate models of Mars and those of Earth. Given that some people distrust claims of global warming on Earth, wouldn't those same people possibly distrust claims of a lack of global warming on Mars?
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