Final answer:
The general movement of climate types in the middle and high latitudes of the Northern Hemisphere is expansion toward the poles.
Step-by-step explanation:
In the middle and high latitudes of the Northern Hemisphere, the general movement of climate types (and thus biomes) from 1976-2000 to 2076-2100 is expansion toward the poles. As global mean temperature increases and climate change occurs, the geographical distribution of species shifts in response to changing climatic conditions. This shift towards the poles is observed in both terrestrial and marine ecosystems.