Anyone who cares about a cause can send a pre-printed postcard, email or letter to their representative or senators in Washington.

Instead, Cathy Spahr is going to throw the book at all 535 of them.

Spahr and a small group of compatriots raised about $4,000 to buy copies of The Lorax, Dr. Seuss’ 1971 parable of greed and environmental destruction. They plan to deliver them to every member of Congress Monday - in person.

“Whether it’s used for a coffee-cup holder, or they take it home to read it to their kids, I hope they’ll think about the decisions they are making about the environment,” Spahr, 43, said in an interview.

The Lorax is a creature who speaks for the trees and animals who have no voice in a mythical valley, warning of doom as another Seuss character, the Once-ler, builds a huge business exploiting the trees and fruit produced in the valley. “Unless someone like you cares an awful lot...nothing is going to get better...It’s not.”

Spahr and crew worked with schoolchildren, who made their own statements about the environment in messages written inside the covers of the books. Juliet, of York, for instance wrote: “Hey man, we’re gonna be a little bit longer than you, so if you could not, ya know, ruin the whole planet, me and my friends would really, really appreciate it.”

Spahr, a zoning official in Newtown Square, participated in Saturday’s march for science in Philadelphia, one of dozens of marches held the same day in Washington and in cities around the world. She said her activism was spurred by the election of President Trump, and his administration’s move away from the Paris accord on climate change and elimination of environmental regulations.

“At the end of the day we can’t breathe money or drink money,” Spahr said.