Mars once ran red with rivers – see https://phys.org/news/2022-05-mars-unusual.html … and https://tallbloke.wordpress.com/2022/05/31/why-did-mars-dry-out-carbon-dioxide-loss-not-a-factor-say-scientists/ … the hunt is on for the missing ingredient. Carbon dioxide is a strong greenhouse gas, they say, so it was the leading candidate to explain the drying out of Mars. The tell tale track of past rivers, streams, and lakes, are visible today, right across the Martian surface. Scientists are unsure what caused the climate to change in such a dramatic fashion.
The new study is in Science Advances, May of 2022, https://www.science.org/doi/10.1126/sciadv.abo5894 … but in the comments section Ned Nikolov chips in, ‘Mars got colder and dried out because it lost most of its atmosphere …’.