Here is a grammatically corrected version of the sentence:
"The article 'Climate Change and Its Effects' states that parts of the world's coastlines have sunk considerably, which many scientists believe to be true."
Changes made:
- Capitalization of the article title: "Climate Change and Its Effects" is treated as a title and should be capitalized properly.
- Corrected “there affects” to “its effects”: This change fixes the incorrect usage of "there" (which is a pronoun) to "its" (which correctly refers to the article), and "affects" (verb) to "effects" (noun), as the context calls for the consequences of climate change.
- Changed "has sank" to "have sunk": "Has" should be "have" to agree with the plural subject "parts," and "sank" should be changed to "sunk," which is the correct past participle form of the verb.
- Changed "believes" to "believe": The verb "believe" should match the plural subject "many scientists."
These changes improve the grammatical accuracy and clarity of the sentence.