How can I help save the planet as a programmer?

First of, I am sorry if this is an irrelevant question to ask here, but I wanted answers from real programmers !

I am studying web development in school and self teaching myself programming language such as C++ and C#.

I am questionning myself, in what field of programming will I work ? What will I do with it ?

Being in contact with people who take the planet conditions and climate change very seriously, I decided to start changing my life habits.

Now I am wondering how the programmer job could help.

So, for my question. How, as a future web developer and C++ programmer, could I help to save the planet ?