Environmental Science
The gas responsible for the greenhouse effect on Venus is:

Water vapor (H2O)
Ozone (O3)
Oxygen (O2)
Nitrogen (N2)
Carbon dioxide (CO2)

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Environmental Science
Infrared and visible satellite images might provide:

A way of identifying clouds suitable for cloud seeding.
A way of determining cloud thickness and altitude.
A way of distinguishing between wet and dry clouds.
A way of distinguishing between "new" and "old" clouds.

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