We have examined various things about environmental problems, but it was very ambiguous where from where to go into environmental problems. But we thought that not only global warming but also things like tobacco littering would be one of the important environmental problems. Littering of cigarettes can have negative effects on living things, and it can be thought that the environment deteriorates. In addition, even using electricity has an adverse effect on the environment indirectly. Currently, the major power generation method in Japan is "thermal power generation", but it will emit a large amount of carbon dioxide to burn coal and oil. In other words, if we use smartphones, personal computers, televisions, refrigerators etc., we can think that we indirectly emit carbon dioxide, which leads to environmental degradation. In other words, something that does not directly lead to environmental destruction, such as littering of tobacco or excessive use of electricity, may be an environmental problems.