Some call it hubris; others call it cool reason. But the idea that we might combat global warming by deliberately
engineering a cooler climate – for instance, by constructing some kind of planetary sunshade – has lately migrated from the
fringe to the scientific mainstream. We are already modifying climate by accident, say proponents of geoengineering; why not
do something intentional and intelligent to stop it? Hold on, say critics. Global warming shows we understand the Earth too
little to engineer it without intended and possibly disastrous consequences. Both sides worry that facts on the ground – rising
seas, melting ice, failing crops – may cut short the geoengineering debate.
【題組】45. The tone of the narrator could be described as ______.
(A) energetic (B) incredible (C) pessimistic (D) ironic (E) concerned