46.First/ tourism/ create/ jobs/ tourism industry/ and/ other sectors/ such/ retail and transportation.

->first, tourism creates jobs in the tourism industry and in other sectors such as retail and transportation
47.However/jobs/ created/ tourism/ often seasonal/ and/ poorly paid.

->however, jobs which are created by tourism are often seasonal and poorly paid
48.Second/ tourism/ encourage/ preservation/ traditional customs/ handicrafts/ festivals/ but/ interaction/ tourists/ also lead/ erosion/ traditional cultures/ values.

->second, tourism encourages the preservation of traditional customs, handicrafts and festivals, but interaction with tourists can also lead to an erosion of traditional cultures and values
49.Finally/ ecotourism/ help/ conservation/ wildlife/ generating funds/ maintaining national parks.

->finally, ecotourism helps conservation of wildlife by generating funds for maintaining national parks
50.Nevertheless/ it/ also cause/ pollution/ through traffic emissions/ littering/ noise.

->nevertheless, it also causes pollution through traffic emissions, littering, and noise