Environmental Science
Warming in the stratosphere is mainly caused by:

Absorption of ultraviolet radiation by ozone
Frictional heating caused by meteorites
Release of latent heat energy during condensation
Chemical reactions between ozone and chlorofluorocarbons

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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:

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

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