----- Not an ESL teacher -----
Only it does not sound natural and lacks a bit of salt. What about:
"Pollutions is a serious problem which scientists try to solve in order that beaches can be safe again."
"Pollution is a well know serious problem which affects, among other several points, the beaches. Currently, plenty of scientists are working on it, trying to find possible solutions to bring our beaches back to an acceptable safety level."
These are only some suggestions from a non-native speaker.