Why did she go to the Paris Climate Accord, when America withdrew from it?

To tell the world that she stands in solidarity with it rather than America.

Which proved exactly what?

She want to join with the Globalists and fundamentally in doing so, destroy the American Republic and replace it with the Socialistic New World Order with UN oversight, which is the stated Goal of the Agenda, when they promise in the preamble that no one will be left behind.

Pelosi believes it is her responsibility to ensure America hands over it's Sovereignty to these Globalists desire, by melding with the Agenda THEY decided is the correct path for humanity.