Question

select the text that has a more objective tone.
the most alarming of all mans assaults upon the environment is the contamination of air, earth, rivers, and sea with dangerous and even lethal materials. this pollution is for the most irrecoverable; the chain of evil it initiates not only in the world that must support life but in living tissues is for the most part irreversible.
over the last three decades there has been increasing global concern over the public health impacts attributed to environmental pollution, in particular, the global burden of disease. the world health organization (who) estimates that about a quarter of the diseases facing mankind today occur due to prolonged exposure to environmental pollution.
from rachel carson, \silent spring\, copyright 2002 by mariner books and from \environmental pollution and impacts on public health\, copyright 2015 by united nations environment programme

Explanation:

To determine the text with a more objective tone, we analyze the two passages. The second passage (starting with "Over the last three decades...") presents facts and data (e.g., WHO estimates) without emotional or exaggerated language, focusing on stating information about environmental pollution's impact on public health. The first passage uses descriptive and somewhat emotive terms like "alarming", "evil", "irrecoverable", "most part irreversible" which indicate a more subjective or persuasive tone. So the text with a more objective tone is the one discussing the global concern over environmental pollution with WHO estimates.

Answer:

The text starting with "Over the last three decades there has been increasing global concern over the public health impacts attributed to environmental pollution, in particular, the global burden of disease. The World Health Organization (WHO) estimates that about a quarter of the diseases facing mankind today occur due to prolonged exposure to environmental pollution."