Which statement from the text best shows the author's main claim? A: this would make a difference in our world by reducing greenhouse gas emissions to slow global warming that heats our planet and sets severe climate changes in motion

Hello. You did not show the answer options, nor did you show the text to which the question refers, which prevents me from answering your question exactly. However, I will try to help you by explaining what a main claim is in a text.

Within a text the main claim is the main idea to which the text presents. It is the subject that the text decides to address.

Usually you find the main claim of a text right at the beginning of the text, because the author needs to arrest readers right from the start showing what the text will discuss about and arresting readers who show interest in the type of discussion presented.