Question

which evidence suggests that earths current warming trends are different from earths natural climate cycle?

a. the current changes are paired with declining carbon dioxide levels.

b. the current changes are happening much slower than past changes.

c. the current changes are happening much faster than past changes.

d. the current changes are much smaller than in the past.

Explanation:

To determine the correct answer, we analyze each option:

• Option A: Current warming is associated with increasing (not declining) CO₂ levels due to human activities, so A is incorrect.
• Option B: Natural climate cycles occur slowly over long periods (e.g., ice ages over millennia). Current warming is rapid (decades - centuries), so B is incorrect.
• Option C: Scientific evidence shows current climate change (warming) is happening much faster than natural past cycles (e.g., glacial - interglacial transitions). This rapidity, along with human - caused CO₂ rise, distinguishes it from natural cycles, so C is correct.
• Option D: Current warming magnitude and rate are significant, and in terms of rate (key for distinguishing from natural cycles), it's faster, not smaller in impact (e.g., temperature rise, ice melt), so D is incorrect.

Answer:

C. The current changes are happening much faster than past changes.