disparaging the facts, denigrating see denigrating science, and we re here to tell him science matters. reporter: speaking to a crowd in washington, science advocate bill nye said science must shape policy, not just in the united states, but arnoound the world. our lawmakers must know and accept science serves every one of us. every citizen of every nation in society. reporter: the marches have been worldwide with demonstrators taking to the streets from sydney, australia, to geneva, switzerland, and from the arctic to the antarctic, researchers and scientists added their support to the cause. at new myers station in antarctica, they summed up the movement with a quote. nothing in life is to be feared, it is only to be understood. now is the time to understand more so that we may fear less. i m andrew spencer reporting. andrew spencer, thank you. president trump didn t respond to the protests, but he did release an earth day statement