Environmental Science
Biogas is composed of

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

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Environmental Science
The earth is tilted at an angle of 23.5o with respect to the plane of its orbit around the sun. If the amount of tilt were increased to 40o, we would expect in middle latitudes:

Hotter summers and colder winters than at present
No appreciable change from present conditions
Hotter summers and milder winters than at present
Cooler summers and milder winters than at present
Cooler summers and colder winters than at present

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