Cancer cells divide without stopping and spread into surrounding tissues. Cancer cells spread into, or invade, nearby tissues. In addition, as these tumors grow, some cancer cells can break off and travel to distant places . They destroy healthy tissues. (from https://www.cancer.gov/about-cancer/understanding/what-is-cancer)
Certain human activities have had a devastating impact on ecosystems, however. From pollution to over harvesting, the damage and exploitation of wildlife and natural vegetation by humans has left some ecosystems in bad shape (like cancer). Humans have destroyed a tenth of Earth’s remaining wilderness in the last 25 years and there may be none left within a century if trends continue (like cancer).
The world’s 7.6 billion people represent just 0.01% of all living things, according to the study. Yet since the dawn of civilization, humanity has caused the loss of 83% of all wild mammals and half of plants, while livestock kept by humans abounds (like cancer).
Briefly, I think that humankind is the cancer of the world, but therapy?!
The rapidly growing population is the root cause of all problems in the world. Therefore, population control is the only therapy to free the world from various problems such as loss of biological diversity, tropical deforestation, environmental pollution, land degradation, resource depletion etc.
Population increase in the world contributes greatly to human problems.
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