Discussion
Match each example of inadvertent modification with its cause.
List I
A. Ship tracks
B. Urban rainfall anomaly
C. Contrail cirrus
D. Reduced snowpack
List II
1. aircraft exhaust in ice supersaturated air
2. exhaust particles brightening marine cloud
3. soot deposition darkening the surface
4. aerosol and heat downwind of a city
Answer: D
Each is a documented effect of human activity on cloud or precipitation. None was intended, and several are larger than the effects deliberate seeding has been able to demonstrate. None of the four was intended by anyone.
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