Our Earth has changed more dramatically in the 20th Century then in any other time period previous. During this time the health of our planet has also been both harmed and improved in dramatic ways. Two examples are that in this century, we have produced more air pollution then ever before, but our nature conservation efforts are working. Based on that type of logic, it is usually very easy for a scientist to tell if …showed first 75 words of 422 total…

…showed last 75 words of 422 total…parents had more confidence that their children would live to maturity. Also, as China has moved to become a more industrialized country families have chosen to reduce family size. For example in our country 200 years ago families were large because the more kids a family had the more successful the farm would be. Those are a few reasons the population rate in China might be lower than in years previous and continue to slow down.