I'm not sure what you mean by 'reached'. I would take out the 'has' before processed and change the 'was' in the final sentence to 'has been' I think passed is a better choice than undergone.

Plastic waste, much of which is undegradable, is the cause of a number of harmful situations.

Nor connects 2 negative ideas. Example: I dont like rice. Nor do I like noodles. In your text its the 2 failures to build a waterway. Realize means to make something real. A plan, idea, or wish can be realised.

Deserve a kiss or get rewarded with a kiss

All words and phrases that make up a sentence are constituents. To the store on the corner of the street is a prepositional phrase.

Remember that some nouns are uncountable and dont take an s in almost all sentences. Other nouns, like person, don't use an s to become plural. Person changes to people. For countable nouns that use s: With a question or negative sentence you use an s. Example: Are there any cups? There aren't any cups. When you have a choice of items and don't care whi home you get you use the singlular noun: A: Give me a cup. B: Which one? A: Any cup. Sometimes the plural and singular can both be used: Any gift put on the table will be opened. Any gifts put on the table will be opened.

The second sentence is correct. The past simple is used to give facts. The present simple is also used: I like ice cream.

Google: british council listening