Robert Johnson argues that new ice sheet growth depends more on heavy snowfall and strong moisture in the northern hemisphere rather than cold temperatures alone. The distribution of ice is influenced by factors like land and sea differences in absorbing and transferring heat, with seas being able to absorb heat deeper and transfer it farther through circulation. Places at the same latitude can experience very different temperatures and climates due to factors like being over land or sea, affecting glacier growth.

1. Robert Johnson- “new ice sheet growth depends less on cold temperatures than on strong moisture and very heavy snow fall in the northern hemisphere ” Present day distribution of ice

3. Ice Albedo

4. Ice albedo

5. Distribution of the earth’s heat

7. Slope/aspect north facing