Are we state of fear

By seeing that a tones of gas coming out from the vehicles, industries and from the household, It makes me to think that do theses gases have affect to our environment. the scientist have their own data and prediction but we want the answer that has a great reasonable and thinkable. As I believe that these all the gases are balance by natural phenomena is nonsense because we are intellectual livings and we know how we shape our earth. Suppose take the example of the world war 2. the millions people are died and millions people became homeless and many more injured. This is the cause of human not a nature. We know that every thing has a limit, a balloon can hold only limited air but if you try to put more in to it will destroy and not longer will be exist. Similarly in this world something is going that is causing our temperature unstable but that can be insignificant but it is continuous, progressive way. All the people existing right now are not in fear for their life but it might take long time that can not be predict right now.