Dan Chu, director of the Sierra Club’s Our Wild America campaign, spent a few days with his family in a small South Carolina coastal town this summer. Enjoying the catch of the day at a local crab shack, they noticed a sign on a grocery store across the road that read, “Don’t ruin our ocean with sonic cannons.” It turns out the waters off the Atlantic coast have recently been opened up to seismic testing — the first step toward offshore drilling. Read Chu’s essay about why new offshore drilling is a bad idea and take action to prevent it.