The Holocene extinction is the human-caused mass extinction of nearly all currently living species. Habitat destruction and over-harvesting are two of the primary causes which drive species extinct. Only 15% of all life has ever been discovered, yet animal species are dying by the millions yearly. This is preventable if mass pollution and mass consumption of the rain forests comes to an end. Sustainable lumber harvesting practices need to become the norm in countries such as Brazil, People's Republic of China, and India.
The Holocene extinction event is one of the greatest dangers mankind faces today. If it is allowed to continue unhindered, it might cause ecosystems on the planet to profoundly collapse. This would cause big problems because we depend on those ecosystems to live.
America's forests were almost entirely destroyed in around 200 years. A completely virgin continent of wilderness before the settlers arrived, now America's natural herds of bison which once numbered in the tens of millions have been reduced to a population of around 200,000. Bald eagles have similarly suffered a 99% decline in their population since European settlers arrived.
The majority of our medicines come from exotic plants and animals, such as the horseshoe crab whose blue blood is used to test for impurities in new medical vaccines. Every seemingly insignificant bird or insect driven to extinction could have potentially contained a cure for cancer, conceivably even a key to greatly extending human life capacities or fundamentally improving the quality of life for people the world over.