Why are we alive?
WHAT'S THE POINT?

There is no point.  ~Life is a simulation~.  

Explanation:

We are just like other organisms. The main purpose of animals is to survive and expand the population. Humans are meant to do the same thing however our brains evolved in a more sophisticated way. Humans originated from Africa. The place where our ancestors come from became very hot, dry and drought-like after a period of nice hot climates. This change in climates forced our brain to think a critically think and resulted in a "mutation". This mutation resulted in a complete change in the way think and ended up making us the smartest creatures in the world. We were more intelligent than the other creatures and know how to survive and adapt to different environments. Also, just like animals, we are meant to maintain our place in the food chain and environment. As animals we are supposed to not affect environments negatively and make sure that we survive while giving other animals their place in the ecosystem.

significant amounts of nitrogen oxides, carbon monoxide, and other pollution

explanation:

passenger vehicles are a major pollution contributor, producing significant amounts of nitrogen oxides, carbon monoxide, and other pollution. in 2013, transportation contributed more than half of the carbon monoxide and nitrogen oxides, and almost a quarter of the hydrocarbons emitted into our air.

sorry, but you do not have posted the diagram.