I once took a boat in Indonesia to travel to another island. it was a two day trip and the boat belonged to the goverment. Every day the staff was just throwing the garbage bags into the water. it was disgusting to see. I can still remember those days clearly. Eco-bricks can be one solution, but a massively support by the goverment will be essential to succeed. Besides government support, education will always be the key factor to prevent this kind of behaviour. Our planet is dying, and changing human behaviour is not an easy task. Also remember: how terrible these images are, the West remains by far the biggest polluter. Just think about how many times an airplane is taken, how much meat is eaten, how long we are in the shower, etc. It sounds contradictory, but the progress of the third world countries will not benefit the pollution.