Organizing for Action, the advocacy group born from President Obama’s reelection campaign, has a simple message for its 35 million Twitter followers as it seeks political support for the White House’s climate agenda.

Gravity exists. The Earth is round. Climate change is happening. #ScienceSaysSo

That’s one of several OFA climate-related tweets Monday ahead of a series of events the group is holding Tuesday in support for Obama’s climate plans.

The group, in a press release, said OFA volunteers are “holding events nationwide [Tuesday] to hold members of Congress accountable for their positions on climate change.”

Obama’s plans rest almost entirely on administrative actions that don’t need congressional approval, including carbon regulations for power plants.