Both. But our destruction is far worse, because generally our creations are designed to make our lives easier/better, whereas our destructive ways often affect the rest of the natural world in often harmful ways.
Both. Humans are like Fire. They are sprouted to create, destroy and then give place for আরো creation through the ashes of old. It is an endless cycle. I'd agree with Blue that Humanity's Destructive capabilities have made themselves আরো apparent. Life on the Planet could still flourish and expand regardless !!!!