More than two dozen Democratic Senators took to the senate floor to show thier commitment to tackling climate change.
U.S. Senators Jeff Merkley and Ron Wyden of Oregon were among them.
Merkley spoke about the costs of carbon pollution on Oregon's economy, particularly farming, fishing and forests.
There is no prospect of getting climate change legislation through this congress, but the session hopes to focus attention on the challenges of climate change and its impact on the environment.
Sevearl Democratic Senators who face tough re-eelction fights skipped the all night session, including Senator Mary Landrieu of Louisana and Mark Pryor of Arkansas.