He was to be taken to the Midtown South police precinct, where charges are pending.
Before he reached the top, Robert managed to post a sign on the side of the Times building.
The green sign states that "Global Warming Kills More People Than A 9/11 Every Week."
On his web site, Robert declares that "Today is World Environment Day. I have climbed in New York, as a peaceful way to create support for far greater and urgent action from world leaders on global warming."
His T-shirt carried the address of a Web site: thesolutionissimple.org.
The NYPD says they plan to have a press availability with officers involved in the response at the site.