Fischer said she believes the climate is changing, but does not know how much human activity plays into it — a point Kerrey criticized.
She responded to Kerrey’s barb by pointing out he supported cap-and-trade legislation and that it would have raised taxes.
Fischer has a healthy 16-percentage-point lead over Kerrey, according to a World-Herald poll released last month. They are vying for retiring Sen. Ben Nelson’s (D-Neb.) seat.
The Hill rates this race likely Republican.