Question

question 9 of 29
why do scientists think current warming trends are not simply earths natural climate cycle?
a. the current changes are paired with declining carbon dioxide levels.
b. the current changes are much smaller than in the past.
c. the current changes are happening much faster than past changes.
d. the current changes are happening much slower than past changes.

Explanation:

Scientists believe current warming is not just a natural cycle because the rate of temperature increase is much faster than historical natural - climate - change rates. Carbon dioxide levels are actually rising, not declining. And the current changes are significant and rapid compared to past natural changes.

Answer:

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