I shall bring this question: Why does global population income level raising, which will influence human's basic essential energy need to be raised as well as why can it influence greenhouse gas consumption to be raised? Some scientists explained these reasons as below: When, human's income level raising, it influences human likes to spend more expenditure for travelling entertainment, e.g. many people like to spend much money to catch air plans to travel often. So, air planes will need much greenhouse gs to provide them to fly often.Schafer et. al (2010) indicated that travel is commonly considered in transportation units of passenger distance ( passenger kilometer). For GHG emissions, the modal split is also important. So, when global general population's income level is increasing, we will like to spend money for any travel entertainment. Any travel entertainment will need any transportation tools, e.g. high speed cars, public transportation, buses, trains, trams and air planes. All any one of these transportation tools which will increase to use greenhouse gas to provide to them to use. So, when global population's income level raising, we will often catch air planes to arrive different countries travel. When, we arrive the countries travel, we will catch the countries' trains, trams buses, ferries to travel in local. So, global any transportation tools will need to increase greenhosue gas to use in order to satisfy global travellers' travelling entertainment needs. So, it explains why global transportation tools' greenhouse gas energy useful number will be increasing because when global population's income level is raising, then human will accept to spend more saving time to travel to different countries.However, in any global travellers' journeys, they will need catch any transportation tools to go to anywhere to travel. So, increasing global traveller number, it will cause global transportation tools to use much greenhouse gas. Then, the greenhouse gas can be raised to charge global transportation servie providers easily because global transporttion service providers will need to buy much greenhouse gas to provide to them to drive.Anyway, when global population income level is increasing, it will lead the greenhouse gas demand to be raised to global every home energy users' home energy need. For example, U.S., Canada these both countries, their temperature will be below thn 0 degree in winter. So, it will be very cold in winter. I shall suppose that when U.S., Canada both countries' populations have high income level, then this high income level people have enough money to either turn on heaters often all day in order to keep their homes more warm and live more comfortable when winter is coming or they can turn on air conditioners often all day in order to keep their homes more cold and live more comfortable when summer is coming. So, the global greenhouse gas energy need will be increased when global the air conditioners and heaters are often turning on all days in winter or summer time.