In my opinion，gas-powered cars are the main reason that greenhouse gases are increasing. As more and more carbon dioxide is released into the air, the earth will quickly become an actual greenhouse. The hot weather around the world have made some people realize that we must find some solutions to solve this problem. However, most people still think that this is not a big deal. They still enjoy their life while doing things which increase air pollution, including drving their cars around. I am really thankful for my country where the government makes a lot of effort to lead people to buy electric cars instead of gas-powered cars. I dont think that it's effective to reduce air pollution by encouraging people not to drive cars for only one day. We have been told to prevent our world from being destoryed by greenhouse gases for many years, but how many countries or people actually did something about it? Some people still enjoy the sound waves from the engines, then go into a house with air conditioning