Global dimming
Global dimming is harming the water cycle of the earth. It reduces the rain, which is very important for the fresh water. In 2001, researchers did a study at the Scripps Institution of Oceanography. The research suggested that the pollutants have a bad effect on the water cycle. Another global dimming event happened in 2006 in northern hemisphere during hurricane season. The NASA study found that the big dust storms happened in Sahara Desert during June and July cause the dust to go over the Atlantic Ocean. The dust forms a cover over the ocean and causes it to cool down. This reduces the hurricanes' development.