Carbon Offset

Do you know the word "Carbon Offset" or "Carbon Neutral"? I found those words in Asahi Shimbun, yesterday evening. One woman joined the eco-tour to Austria to look around its power plants which generate alternative energy. But by using planes to her round-trip, the plane exhausted 2 tons of CO2. It worthes 1/5 of an annual amount of discharged CO2 per capita. She paid a NGO and ask to plant some trees in Mongolia. The NGO calculated that trees would compesant the CO2 which she had generated in 20 years. Such movement to compesant the CO2 which a person discharged with cooperation in activities that decrease CO2 or generate alternative energy is called "Carbon Offset" or "Carbon Neutral". Last year it was gathered some attentions. The world cup which held in Germany was involved this activity; 0.1 million of CO2 that has increased during the games was compensated by investment in environmental services in developing countries. I haven't known such activity. I think that cannot be fundamental solution in CO2 problems because investment and afforestation can't catch up the discharged amount. We have to serch more effective way, I think. But it is better to do something than not to do anything. I will do it in my next trip...