All of the Following Are Ecological Tipping Points Identified by Scientists

Multiple Choice

All of the following are ecological tipping points identified by scientists except

A) Sharp increase in the ability of the ocean to absorb carbon dioxide.
B) Collapse and melting of Greenland ice sheets.
C) Collapse of the Amazon rainforest.
D) Major releases of methane from permafrost.
E) Collapse of phytoplankton populations.