A free presentation about sunscreen pollution is scheduled for 6 p.m. today at the Natural Energy Laboratory Hawaii Authority Visitors Gateway Center, 73-4485 Kahilihili St. in Kailua-Kona.

Craig Downs will present “Sunscreen Pollution and the Threat to Hawaii’s Coral Reefs.”

Downs is executive director of the Haereticus Environmental Laboratory in Virginia and an expert in environmental forensics and ecotoxicology.

In a follow-up to the lecture, the film “Reefs at Risk” will be screened at 7:30 p.m. Saturday at Kalani Retreat Center, 12-6860 Kalapana-Kapoho Road in Pahoa, along with the movie “Aloha from Lavaland.”

A “sunscreen swap” also will be conducted that night. Bring a conventional sunscreen product and organizers will swap it for a “reef-safe product” for free.

Tickets are $5 at the door. The film also can be viewed online at www.ReefsAtRisk.org.

A free presentation about sunscreen pollution is scheduled for 6 p.m. today at the Natural Energy Laboratory Hawaii Authority Visitors Gateway Center, 73-4485 Kahilihili St. in Kailua-Kona.

Craig Downs will present “Sunscreen Pollution and the Threat to Hawaii’s Coral Reefs.”

Downs is executive director of the Haereticus Environmental Laboratory in Virginia and an expert in environmental forensics and ecotoxicology.

In a follow-up to the lecture, the film “Reefs at Risk” will be screened at 7:30 p.m. Saturday at Kalani Retreat Center, 12-6860 Kalapana-Kapoho Road in Pahoa, along with the movie “Aloha from Lavaland.”

A “sunscreen swap” also will be conducted that night. Bring a conventional sunscreen product and organizers will swap it for a “reef-safe product” for free.

Tickets are $5 at the door. The film also can be viewed online at www.ReefsAtRisk.org.