it is not evidence of liquid water, it is evidence that liquid water probably exists. It's just the most likely explanation.
FULL article: http://www.dailymail.co.uk/sciencetech/article-2022513/Mystery-lines-Mars-carved-water.html
Google "mars warming" and you'll find numerous reports. If you look just a little bit, you'll find one about a 2nd red spot on Jupiter they believe is caused by warming.
The only reputable source I found was national geographic and they point out the perturbations in the revolution in the sun cause the change in the climate. (get too close the CO2 caps melt, get too far and they build up) Because mars doesn't have a moon to balance it, the planet wobbles more frequently.
http://abcnews.go.com/Technology/story?id=98168&page=1 http://www.msnbc.msn.com/id/1795263...ce/t/dust-storms-causing-global-warming-mars/ http://www.livescience.com/1349-sun-blamed-warming-earth-worlds.html And this one: http://www.nature.com/nature/journal/v446/n7136/full/nature05718.html It's pretty obvious that the earth's albedo has a HUGE effect on warming. As the glaciers from the ice age 10,000 years ago receded, there was less and less white stuff (snow, ice) to reflect solar radiation back into space, and what the glaciers uncovered was dark enough to absorb heat from the sun. You can't assume that the temperature increased at a steady rate per year from 10,000 years ago to today. There's a feedback mechanism where you have less white -> more heat absorbed -> more ice melted -> less white. So you'd expect the warming to accelerate over time. There are lots of other factors besides albedo at work, which is what makes modeling climate change near impossible and certainly unreliable. As pointed out, we had a serious period of global cooling in medieval times, and the earth was MUCH warmer than now during the times of the dinosaurs. Asphalt is extremely efficient at trapping heat (it's also very dark), so that might be man contributing to warming by speeding up the feedback loop. There sure is a lot of asphalt everywhere. Clear cutting forests and especially rain forests removes a LOT of trees that breath in CO2 and breath out O2.
Holy cow, us humans are now the source of galaxy warming. Al Gore & Company may have been fully discredited now on our earthly global warming, but now he has a whole new agenda.
The first one doesn't mention perturbation or the actual cause of the warming, just that it is warming. The second one suggests dust storms, which is still an essentially closed system and doesn't help my case. The third one mentions perturbation almost immediately. The albedo stuff is scary, I had heard about that a little while ago and it makes me wonder what point it switches from accelerated heating to cooling.
They say that dust was the cause of numerous ice ages in the past. Dust contains iron, and the iron feeds algae that grows enough to influence the CO2 and O2 levels. Fwiw
