Fact: If we didn’t run our rainwater into the ocean, the city of Los Angeles would have to buy a lot less water from fewer places. How much less depends on who’s talking, but Brad Lancaster, author of Rainwater Harvesting for Drylands, can tell you how to make the most of it at a talk hosted by the Santa Barbara Permaculture Network. Los Angeles Eco-Village, 117 Bimini Pl., L.A.; 7:30 p.m.; free. (805) 962-2571.
Down and dirty: Heal the Bay folks clear waterways of trash;
Santa Monica College student Sai Duhamel and the city of Santa Monica join forces for a talk on sustainable packaging called “Cutting Waste and Cleaning Our Coastline.” Just say no to Styrofoam! Santa Monica College Bundy Campus, 3171 S. Bundy Dr., Santa Monica; 6:45 p.m.; free. (310) 434-4743.