The tilted sides would still not work due to the way the Earth's climate was set up, we would all of the water and the air in out atmosphere before long. Total energy is constant because it literally can't be destroyed though I will have to do some more research to see if the other ones are true or not. As well as the fact that the resource you posted seems to be a high school teaching source which aren't the most accurate.Okay then the tilted sides of the Earth could work
Some assumptions
- Everything is mechanical or material if you prefer
- All matter is unconcious
- Total energy (and thus matter) is constant
- Fixed laws of nature
- Here are some more http://undsci.berkeley.edu/article/basic_assumptions