That's at least according to a study recently published in the journal Icarus, which details how researchers assessed images of hundreds of gully-like features found on the walls of impact craters
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/drastic-climate-change-carved-mars-and-may-still-be-happening
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/nature-world-news
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/el-nino
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/world-meteorological-orgnisation-wmo