<p>Sounds a lot like Environmental Engineering:</p>
<p>From Wikipedia
“Environmental engineering is the application of science and engineering principles to improve the natural environment (air, water, and/or land resources), to provide healthy water, air, and land for human habitation (house or home) and for other organisms, and to remediate polluted sites.”</p>
<p>As for slum reversal, that’s not really an engineering thing unless you can turn dirt into gold or something like that.</p>