Cloud cover values only vary by 0.03 from year to year, whereas the local, day to day variability in cloud amount typically rises to 0.3 over the globe.
2.
The report states " Cloud feedback studies point to five aspects of the cloud response to climate change which are distinguished here : changes in high-level cloud altitude, effects of hydrological cycle and storm track changes on cloud systems, changes in low-level cloud amount, microphysically induced opacity ( optical depth ) changes and changes in high-latitude clouds . " The net radiative feedback is the sum of the warming and cooling feedbacks; the executive summary states " The sign of the net radiative feedback due to all cloud types is less certain but likely positive.
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