Sentences of a paragraph are given below in jumbled order. Arrange the sentences in the correct order to form a meaningful and coherent paragraph.

a. Because of this, the city's sewers, the lifeblood of the city, are disrupted.

b. All of this plastic trash clogs up the soil and suffocates the wetland ecosystem.

c. According to a recent study, around 250 tonnes of plastic waste are produced daily by major urban colonies alone.

d. It is unfortunate that millions of people come home every day carrying brightly coloured plastic bags full of merchandise.