Why it matters: Per the Times, this a test of the movement's impact — by causing disruptions and getting noticed by political leaders who are in NYC for the United Nations Climate Action Summit 3 days later and the General Assembly meeting that follows it.

The big picture: Youth strike advocates Fridays for Future said more than 2,400 events were taking place Sept. 20–27 to coincide with the UN climate summit on Sept. 23, where Swedish climate activist Greta Thunberg is due to make an address.

More than 115 countries and 1,000 cities have registered so far, the group said.

"All eyes are on the United States which already has 145 cities signed up, with participation that is expected to be tenfold when compared with the first two global strikes in March and May of this year."