Assertion (A) : Sustainable development is critical to well being of human…

Concept

An assertion–reason item is settled in two independent stages, and the order matters. Stage one judges each statement on its own: is the assertion (A) a true statement, and is the reason (R) a true statement? Stage two arises only when both survive stage one, and asks a different question — does R supply the causal ground of A, that is, does R answer “why is A the case?”

The two stages are independent because truth and explanatory power are different properties. A statement can be entirely true, and even topically related to the assertion, and still fail as an explanation, because it answers a different question. Defining a term, or naming a condition that is merely necessary for the assertion’s subject, is not the same as giving the reason the assertion holds.

Application

1. Truth of (A). Sustainable development is development that meets the needs of the present without compromising the ability of future generations to meet their own needs (Brundtland Commission, Our Common Future, 1987). Human food, water, health and livelihoods rest on ecosystem services and a finite resource base, so development that preserves that base is indeed critical to the well being of human society. (A) is a true statement.

2. Truth of (R). “Environmentally sound policies do not harm the environment or deplete the natural resources” is definitionally correct: not damaging ecosystems and not exhausting resources is precisely what makes a policy environmentally sound. (R) is a true statement.

3. Stage two — the explanatory link. The two statements are topically connected: environmentally sound policy is one instrument of sustainable development. But connection is not explanation. (R) never says why sustainable development matters to human society; it states the defining property of a policy category, that is, what makes a policy environmentally sound. Two gaps follow. First, (R) is a definition rather than a cause: “environmentally sound policies do not harm the environment” holds true by what the phrase itself means, so it carries no independent causal weight. Second, the scope does not match: sustainable development is broader than environmental soundness, spanning economic viability, social equity and the needs of future generations, so a claim about environmental non-damage alone cannot ground a claim about the importance of sustainable development to human well being as a whole.

4. Both statements therefore clear stage one, but R does not supply the causal ground of A.

Cross-check

Put the “why?” question to (R) directly: “Why is sustainable development critical to human well being?” A genuine explanation would answer something like “because natural resources are finite and their depletion would strip future generations of the ecosystem services their health and livelihoods depend on.” Had (R) been worded that way it would have grounded (A), and the code asserting that (R) correctly explains (A) would have applied. As actually worded, (R) answers a different question: “what makes a policy environmentally sound?”

Also verify that neither statement is defective, since that is what stage one is for: the Brundtland definition confirms (A), and the wording of (R) is a standard definition rather than an error, so neither the code that calls (R) false nor the code that calls (A) false describes this pair.

Result: both (A) and (R) are correct, but (R) is not the correct explanation of (A).