You don’t have to think too hard. Just go back to the year 2000, when Sociedade Ponto Verde launched a campaign where a chimp was taught to recycle, separating glass, paper and cardboard. 18 years have passed and today the Portuguese separate 17% of the waste they produce. Celia Dias Ferreira says it is possible to do more. The CICECO researcher clarifies that the treatment of undifferentiated garbage is a cost that is charged to residents: if you look at the water bill in detail you will find the waste tariff. The more water you use, the more you pay the waste tariff, even if you recycle more. A project co-financed by the European Union’s LIFE program is testing different ways of implementing Payt tariff systems according to the reality of each municipality. The podcast for this issue can be found here.