Before Darth Malak's orbital bombardment, Taris was a dying world. Industrial pollution had irreparably damaged the oceans, and chemicals and toxins poisoned the undercity's foundation. When the sprawling metropolis was reduced to rubble, countless pollutants were released into an already tainted ecosystem.
But this was not the end for Taris. For hundreds of years, the planet went without sentient interference, and the ecosystem began to adapt and thrive. Rich vegetation grew within the ruins, scaling steel towers and thrusting aside fallen skyscrapers. Animals‒some native to the planet, some pets and lab specimens that had survived the bombardment‒bred and repopulated the developing jungles.
Of course, some areas remain too polluted to inhabit‒acidic lakes and radioactive sinkholes‒but for the most part, Taris is an environmental success story and an object of fascination for scientists. The largest black mark remains the rakghoul plague, and the fear that it may one day spread to Taris's animal population.