In the context of climate change, describe what is happening to the zone of accumulation and the zone of ablation in glaciers today?
a) The zone of accumulation is decreasing, and the zone of ablation is increasing.
b) Both the zone of accumulation and the zone of ablation are decreasing.
c) Both the zone of accumulation and the zone of ablation are increasing.
d) The zone of accumulation is increasing, and the zone of ablation is decreasing.