Answer:
Awareness programs and high fine.
Step-by-step explanation:
Awareness programs and high fine on throwing litter are the two intervention programs which implement by the government in order to encourage tourists not to litter. Slogans about cleanliness on different recreational spots leads to the creation of awareness in tourists while on the other hand, high fines on the litter will also prevent the tourists from creating litter in the tourist's spots so we can conclude that these two methods encourage tourist to produce no litter.