The first-ever field test of ocean alkalinity enhancement in the United States was pushed back to 2025 due to shipping issues. But the geoengineering experiment has also run into public opposition from local environmentalists, commercial fishers and others.

The test would dump sodium hydroxide (commonly called lye) off the New England coast to study its dispersal as a potential tool for sequestering CO₂.

Opponents allege this small-scale geoengineering test could harm local wildlife, but researchers say the material will disperse within minutes. The scientists say they will also continue to reach out to local communities to alleviate fears over the study.