No, you’re definitely not stuck with Environmental Science. My friend managed to switch from Environmental to Computer Science last semester. This is what the page says:
“Admission from Other Stony Brook Programs
A large number of CEAS baccalaureate graduates were admitted to their program major after completion of one or more semesters at Stony Brook, either because they did not apply earlier, did not initially meet the admission criteria, or have changed their personal goals. On-campus students apply through the Department of Electrical and Computer Engineering. The admission criteria are based on completing at least 11 credits of required mathematics, physics, and engineering courses with an overall GPA of at least 3.0 in required courses. Students with a GPA slightly below 3.0 may petition for admission to electrical engineering. The undergraduate committee in the department considers these petitions based on the merits of each case [Application Form].
Students admitted to the electrical enginnering program complete a change of major declaration form which is signed by the Undergraduate Program Director. Students take this form the Registrar office where the change of major is recorded in the online system. Subsequently, a file is established for each newly admitted student and kept in the department.”
If you really want a specific track goal for yourself, I suggest contacting the Electrical Engineering department advisor or your own personal undergraduate advisor.
Forgot to say this, but don’t 100% trust what the advisors say. Make the final decision from a combination of the advisor and your own research.