Sentence Correction

Many climatologists now suspect that the effects of global warming will include unusual temperature fluctuations throught the northern and southern hemispheres that far exceeds what scientists at the Kyoto Summit were prediting only a few years ago.

A) far exceed s what scientists at the Kyoto Summit were prediting only a few years ago
B) far exceed s those predicted by scientists at the Kyoto Summit only a few years ago
C) exceed is by far that which scientists at the Kyoto Summit had predicted only a few years ago
D) exceed by far those that scientists at Kyoto Summit had predicted only a few years ago
E) far exceed what sceintists at the Kyoto Summit were predicting only a few years ago

Can someone please explain the difference between D and E.

oA: E