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Though we have talked about air pollution for many years, there are still a lot of people around the world don't care about it. Thid reminds me of a great Chinese saying that goes "only a person bumps into a wall, then he can go back". It means that someone don't realize that they are just making some mistakes, others try to prevent them, but failed.They keep doing wrong things until they get publishments from their mistakes. The same thing some people still do for air pollution. They drive cars every day and never think that the vehicle exhaust does cause air pollution. If you tell them the truth, they even take some deep breaths to show that they are healthy. It's really hard to change someone's mind. They just care about themselves. They can't see the bad results due to air pollution. In that case, if you ask them to join a car-free day activity, they might think that you are silly. It won't appeal to them, but if the law tells them to reduce driving to protect the environment, they would carefully think about the relation between vehicles and air pollution, then keep the law.
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Is it possible for people to travel to stars far from solar system in the future? I came across an article online about NASA's take on that and I'll share it here. The closest star to solar system is "Proxima Centauri" and it means the next closest star to Earth after the sun. It is about 4.2 light-year away. It takes more than four years for even light with about 300,000 km per second to get there. In the case of Voyager1 launched in 1977, it would take about 70,000 year to get to "Proxima Centauri" if it was heading in the right direction. That's why we need the technology that we can move at the speed of light in the future. Terrible accidents might occur even when tiny dusts hit our starship if it could move at the speed of light. We also need the durable starships that can get over the damage. Many countries plan to send people to moon in the near future. We already have some service, such as GPS and Internet, with satellites in stationary orbit. Hence, new produces and new service in between Moon and Earth will come out one day. We still have many challenges to carry out the trip to stars, but it seems like a doable trip. Unfortunately, I don't think I can experience the trip because I definitely will die.
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