Japan is producing only 30 percent of foods which Japanese eat. “Too many inhabitants” means much risk to get foods. I have two children and I paid enough money for their education. But If I had several children, I would not be able to pay…

In Japan, people are worrying about declining birth rate. Is declining birth rate also really bad? Observing the history, “too large population” sometimes was adjusted by war, plague and starvation. Nowadays we can adjust populations witho…

People believe that global warming should be stopped. But which is better that the earth is becoming warmer or colder? During the warming time of the earth, mankind and animals can get foods easily. The ice age is terrible time for living …

The causal relation between CO2 and “global warming” has not been demonstrated well by science. It is difficult to say that cutting CO2 means stopping global warming. We have another question. Is CO2 always bad for the earth? Plants need C…