Sustainability?

 On the surface of the earth the earth's ecology can sustain around 1 billion people for thousands and thousands of years.

However, if everyone lived underground and the surface was left for farming and recreation and roads and such we could likely sustain 14 billion people I'm thinking. There also might be other alternatives to this that I have not yet considered as well which you might think up.However the two ways I have so far figured out are above for the ongoing survival of the human race for thousands and thousands of years into the future.

I know some people are worried about things like Microplastics in our blood and air and brains and bodies. However, microplastics are ONLY one thing that humans will have to adapt to in the present and future. 

For example, electric Cars will kill many children and adults over time just like Cell phones will also kill people who wear those cell phones over their hearts over time. But, dying from Electric Cars and Cell phones next to your heart is only 2 of hundres or thousands of ways people's bodies are going to have to adapt to surviving here on earth in the future.

So, in some ways everything new we invent (like Plastics) or electric Solar powered Cars for example, everyone on earth (WHO SURVIVES THESE THINGS) will have to both biologically and psychologically have to adapt to.

I was realizing today with my 7 year old grandson just how brilliant he is and how he likely will grow up to be a doctor like he wants to. However, I could also see the effects of electronic games all the time and different TV programs than I watched at his age as well as different things going on in the world around him which is going to make every aspect of his life much much different than mine.

So, thinking about how to get our children and Grandchildren to survive all these changes and still prosper in all ways is a very important consideration now for everyone who wants their children and grandchildren to succeed and survive at all here on earth.