The environment we live in will change dramatically in the next 50 years. Nowadays, it is changing because of the unawareness of most people who continue to harm our planet.
With small things and actions, people can avoid a dramatic disaster. For example, saving water specially in countries where people are not suffering tremendously water scarcity. We must not expect until the water becomes more scarce. This produces less and less water and in 50 years or less as a result it will have dissapeared.
Apart from this, the growth of transports in all cities is increasing the air pollution and nowadays, we have huge problems to breath. I think that in the future we will not have clear oxygen and as a consequence a lot of people will have died because of this
https://www.youtube.com/watch?v=-ui4Aa3EpKE.