Future underwater city

One of the most "hot" topics in today's society is energy conservation and emission reduction, because we used to cut down trees, not saving energy around us, but also let the factory discharge a lot of industrial waste into the air, so that the atmosphere will be exposed year after year. persecution……….
As you can imagine, no matter how we save energy, we will run out after a few hundred years, or thousands of years, so I am going to create an "underwater city."
First of all, this underwater city is built under the deep sea. Not only are there many traffic lanes made of glass transparent pipes. There are also a lot of high-tech "in and out of the net" - with it, you can let a drop of water leak when you go out, when you come back, you can absorb all the water. In this underwater city, my favorite is the "large air converter", which instantly turns the polluted air into the only condition we can survive under the sea - oxygen. Speaking of this, do you think it is incredible?
The most important thing is our living area. From the outside, it looks like a giant glass marble, yellowish, and. It feels smooth as well. We live in the center of the pinball, which has many tall buildings, the highest of which is as high as forty floors. There are also some playgrounds, although they look ordinary, they are fired at high temperatures in porcelain.
I hope that the underwater city I created can see it underwater after hundreds of years or thousands of years.