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<p>Courses 1E (Environmental) and 3 (Materials Science and Engineering).</p>
<p>Anything is feasible - there are just varying degrees of difficulty. 
Looking at these degree charts may help:</p>
<p>[MIT</a> Course Catalogue: Course 1-E](<a href=“http://web.mit.edu/catalogue/degre.engin.ch1e.shtml]MIT”>http://web.mit.edu/catalogue/degre.engin.ch1e.shtml)</p>
<p>[MIT</a> Course Catalogue: Course 3](<a href=“http://web.mit.edu/catalogue/degre.engin.ch3.shtml]MIT”>http://web.mit.edu/catalogue/degre.engin.ch3.shtml)</p>
<p>Note that Course 1 and Course 3 both have “flexible” options (Courses 1A and/or 3A) that may help you.</p>