Final answer:
Lines that depict environmental challenges or the uniqueness and delicacy of Earth can support the title 'The Ailing Planet.' Texts or imagery that underscore the planet's fragility or conservation needs would be relevant.
Step-by-step explanation:
To locate lines in the text that support the title 'The Ailing Planet,' it is essential to identify passages that highlight the Earth's environmental challenges and the fragile condition of our planet. This might involve descriptions of dwindling biodiversity, climate change, or pollution. For instance, LibreTexts might contain vivid imagery of an environment that's struggling or deteriorating, which metaphorically suggests that the planet is indeed ailing.
A painting commissioned by NASA that conveys the idea that there are many Earthlike planets suggests the uniqueness and delicate nature of our own planet, which requires conservation. Moreover, literature such as Marcy's "The New Search for Distant Planets" discussing the ongoing search for planets beyond our solar system could emphasize the singularity and the currently irreplaceable nature of Earth, reinforcing the idea that our planet is in a state of illness and warrants a title like 'The Ailing Planet.'