What are the benefits of satellites used for ocean exploring?

Question

Does it effect the environment in a good or a bad way?

Also, are we still using this technology?

Answer 1

When is your assigment due?

And yes we are still using this technology.

If a satellite effects the environment then it brings it about, I think you (or your teacher?) mean "affects."

The other question needs quite some research and to form opinions, sorry I cannot do that for you.

Answer 2

google "satellite oceanography"

The first four links are from UCSD, TAMU, URI, and NOAA/NODC.  All reputable institutions with great websites.  

There are so many good websites out there discussing this topic it is silly to ask this question here.  You will get much better, and more comprehensive information by doing just a little research yourself.