When the oceans are dead people won't be able to breathe without enough trees

So then, the winds I foresee become a problem because for example, where I live in one storm over 100 trees went down within 10 miles of where I live in the last 2 months. (and all these trees were 1 to 4 feet in diameter in their trunks.) They were mostly pine trees but also oaks along the coast of California. So, when the oceans die from pollution and overfishing like they are beginning to now all over the world, there will be no plankton left alive to make oxygen for people to breathe. Then it falls upon trees to make oxygen so people can breathe but if winds over 100 miles per hour caused by Global Warming blow down all the trees people won't be able to breathe. (Unless they use water and separate the water into Hydrogen and Oxygen using solar power.

But, that is a temporary fix because then eventually there is no more water left to be able to breathe eventually once you separate all the water into hydrogen and oxygen. So, doing this ongoing would also be suicide for the planet just like Global Warming also is.

The problem is that when humans and animals all breathe what we breathe out is Carbon dioxide (CO2).

But, we cannot breathe that and need diatoms (plankton) and such or trees and plants to take our CO2 carbon dioxide and to remove the carbon from it so we can breathe oxygen.

But, if there are no trees left standing they cannot do this for us anymore if the winds are too high.

However, I suppose we could move underground and grow trees with grow lights or in greenhouses that might be impervious to the winds if we used bulletproof glass or something like that or bulletproof plexiglas. This might be another temporary solution so people could keep breathing oxygen.