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The organisms once living there have either moved elsewhere, or are dead, leading to a decrease in biodiversity and species numbers. [ 113 ] [ 114 ] Habitat destruction is in fact the leading cause of biodiversity loss and species extinction worldwide.
The total biomass of wild mammals has decreased by 82 percent, while humans and their farm animals now make up 96 percent of all mammalian biomass on Earth. [10] Additionally, since 1992 the land requirement for human settlements has more than doubled worldwide; [ 25 ] and humanity has rendered 23 percent of Earth's land ecologically degraded ...
The organisms once living there have either moved elsewhere, or are dead, leading to a decrease in biodiversity and species numbers. [1] [2] Habitat destruction is in fact the leading cause of biodiversity loss and species extinction worldwide. [3]
The World Wildlife Fund’s Living Planet Report 2022 found that wildlife populations declined by an average 69% since 1970. [1] [2] [3]The Living Planet Index (LPI) is an indicator of the state of global biological diversity, based on trends in vertebrate populations of species from around the world.
The diversity of species and genes in ecological communities affects the functioning of these communities. These ecological effects of biodiversity in turn are affected by both climate change through enhanced greenhouse gases, aerosols and loss of land cover [citation needed], and biological diversity, causing a rapid loss of biodiversity and extinctions of species and local populations.
For example, a 42 year study of insects in the pristine Breitenbach stream near Schlitz, which is believed to have been unaffected by anthropogenic decline related causes except for climate change, found that while abundance of insects decreased, biodiversity actually rose, especially during the first half of the study. [44]
Between 2000 and 2005 the rate accelerated to 1.43% per annum. However, with a long history of policy and laws towards environmental protection, deforestation rates of primary cover have decreased 35% since the end of the 1990s thanks to a strong history of conservation measures. [40]
This found that 32% of species were globally threatened, at least 43% were experiencing some form of population decrease, and that between 9 and 122 species have become extinct since 1980. [3] As of 2010 [update] , the IUCN Red List , which incorporates the Global Amphibian Assessment and subsequent updates, lists 650 amphibian species as ...