【填句补文】Rough estimates in the past have predicted similarly disappointing results. ________ Says Sallie Chishol, an environmental engineer from the Massachusetts Institute of Technology. "But the take-home message is the same. Ocean fertilization is not the answer to global warming."
A
"These are newer and better models,"
B
Its opponents argue, however, that it will stop global warming.
C
Adding iron to patches of ocean can make plankton bloom temporarily.
D
As plankton die and settle on the ocean floor, their carbon is supposedly locked up in the seabed.
