Two Madison marches Saturday, the March for Science and the People's Climate March, drew thousands of people to the Downtown, police said.
Both events took place without incident, with no arrests, injury or damage reported, according to Madison Police Lt. Kelly Donahue.
Donahue said about 5,000 people attended the March for Science and 2,500 took part in the People's Climate March.
MPD Special Events Team, patrol and other personnel worked to make the events safe, she said.
Crowds gathered in Washington D.C., and more than 600 similar protests reportedly took place around the world to coincide with Earth Day.
The marches were in support of science and evidence-based research, and fueled in part by President Donald Trump's threats of cuts to agencies funding the work of scientists.