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Human overpopulation along with profligate consumption the north carolina tar heels football team full over printed shirt are considered to be the primary drivers of this rapid decline. The 2017 World Scientists’ Warning to Humanity stated that, among other things,

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It is estimated that more than 50 percent of all wildlife has been lost in the last 40 years. It is estimated that by 2020, 68% of the world’s wildlife will be lost. In South America, there is believed to be a 70 percent loss. the north carolina tar heels football team full over printed shirt  A May 2018 study published in PNAS found that 83% of wild mammals, 80% of marine mammals, 50% of plants and 15% of fish have been lost since the dawn of human civilization. Currently, livestock make up 60% of the biomass of all mammals on earth, followed by humans (36%) and wild mammals (4%). According to the 2019 global biodiversity assessment by IPBES, human civilization has pushed one million species of plants and animals to the brink of extinction, with many of these projected to vanish over the next few decades.

Biodiversity generally refers to the variety and variability of life on Earth, and is represented by the number of different species there are on the planet. Since its introduction, Homo sapiens has been killing off entire species either directly or indirectly , causing the extinction of species at an alarming rate. Humans are the cause of the current mass extinction, called the Holocene extinction, driving extinctions to 100 to 1000 times the normal background rate. Though most experts agree that human beings have accelerated the rate of species extinction, some scholars have postulated without humans, the biodiversity of the Earth would grow at an exponential rate rather than decline. The Holocene extinction continues, with meat consumption, overfishing, ocean acidification and the amphibian crisis being a few broader examples of an almost universal, cosmopolitan decline in biodiversity.