Like many others, you are missing an important distinction here. You assume that humans are the cancer of the Earth because we are human. But in fact, the roots of our global cancer are not genetic—not an inherent part of our human nature— but rather, epistemological—rooted, that is, in the assumptions we make about our world. And those assumptions are cultural, not innate. The “cancer” began with the Agricultural Revolution, some 10-12 thousand years ago, which was a runaway feedback loop: more (storable) grain, more people—hence more need for yet more grain. And because monocultures of annual grain depleted the topsoil, they needed to grab ever more land, turning diverse ecosystems into more grain monocultures to feed the ever-growing population. This feedback loop led in short order to a host of other consequences, including specialized skills, cities, surpluses for trade, and new religions that alienated humanity from its biological roots by creating gods in the image of our kings and rulers, and then turning around and claiming that we humans were created “in the image of god” to “have dominion” over all of nature, and to fill the Earth and “subdue” it to our own purposes—that is, to turn nature into commodities as quickly as possible. So “wilderness” became the “heath,” the accursed land of the “heathens”—again to be conquered uand turned into yet more monocultures, farmed by cheap peasant labor. Needless to say, the Industrial Revolution turbocharged this process of rampant population growth and ecocide. BUT—we are not innately alienated from the rest of life. We still have the option, if we take it, of establishing a symbiotic, rather than parasitic relationship with our biological support system—with “nature” or Gaia. And many pioneers throughout the world are pursuing this option right now. It’s called Permaculture, which is nothing more than using human intelligence as our indigenous ancestors did—to live symbiotically with the living systems that sustain us all—sun, wind, water, topsoil, and biota. We can do it if we choose, by growing gardens, growing community, and growing awareness—starting in our own backyards.