Tijuana artist Alfredo "Libre" Gutierrez recently finished a mural that adorns the entrance to Los Sauces park in Playas de Tijuana.

Published on September 30, 2013

The bottles fill space inside the bench structure of rebar and concrete.

Published on October 7, 2013

4Walls Int'l pays Tijuana residents for each plastic bottle they deliver stuffed full of plastic bags and Styrofoam.

Published on October 7, 2013

Plastic bottles filled with trash can function as fill space inside the structure of a bench or wall.

Published on September 30, 2013

Visitors to Los Sauces park in Tijuana can rest on benches made of trash harvested from the Tijuana River watershed.

Published on September 30, 2013

Illegal dump sites proliferate in some of the Tijuana canyons that make up the Tijuana River watershed in Mexico. They send trash and sediment downstream, clogging the estuary and threatening birds and other wildlife.

Published on September 30, 2013

Despite periodic clean-up efforts, the canal at the bottom of Los Laureles canyon in Tijuana frequently re-fills with trash.

Published on October 7, 2013

The Tijuana River Valley and estuary make up the last intact coastal wetlands in Southern California.

Published on October 7, 2013