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

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

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Environmental Science
Biogas is composed of

ethane, carbon dioxide, nitrogen and hydrogen
carbon dioxide, nitrogen and hydrogen
methane, carbon dioxide, nitrogen and hydrogen
methane, carbon dioxide, nitrogen and sulphur

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Environmental Science
The most important reason why summers in the Southern Hemisphere are not warmer than summers in the Northern Hemisphere is that:

The earth is farther from the sun in July
The sun's energy is less intense in the Southern Hemisphere
Over 80% of the Southern Hemisphere is covered with water
The earth is closer to the sun in January

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