Above all, pollution and, consequently, growing traffic are the most important problems happening nowadays in any city. We all have lived the consecuences of those problems through one way or another. For instance, we are seriusly facing climate change, which is made by mainly petrol. Another example is the traffic that we go through every day wasting a lot of time. There are many solutions to resolve this situation such as increas the price of pretrol, promote the use of public trasport, prohibit the use of certain vehicles which have already been used enough, etc. In the next text we are going to assess whether increasing the price of petrol is a good idea to stop the growing of traffic and pollution or it is not the best.