Warming in the Northern Hemisphere was large in

WarmingintheNorthernHemispherewaslargein________atmiddleandhighlatitudes.

producesmuchmoreglobalwarmingthanacarbon-dioxideforcingofthesamemagnitude

contr ibutedto25percentofobservedglobalwarming

winterandspring

thewarmingeffectsincrease

stillsurpasssootwarmingtheworld'sclimateduringthelastcentury

canbeseenmostlyintheNorthernHemisphere

答案及解析：本句定位到第七段的首句,在春季和冬季,中高纬度地区的气温变化最为明显。