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For example, it was estimated in 2007 that up to 30% of all species will be extinct by 2050. [4] Destroying habitats for farming is a key reason why biodiversity is decreasing today. Climate change also plays a role. [5] [6] This can be seen for example in the effects of climate change on biomes.
Global biodiversity is the measure of biodiversity on planet Earth and is defined as the total variability of life forms. More than 99 percent of all species [1] that ever lived on Earth are estimated to be extinct. [2] [3] Estimates on the number of Earth's current species range from 2 million to 1 trillion, but most estimates are around 11 ...
After the start date was delayed for a third time, the Convention was split into two sessions. A mostly online event took place in October 2021, where over 100 nations signed the Kunming declaration on biodiversity. The theme of the declaration was "Ecological Civilization: Building a Shared Future for All Life on Earth".
The Earth has many diverse ecosystems and ecologicalsystem diversity. These are NASA composite images of the Earth: 2001 (left), 2002 (right), titled The Blue Marble. Ecosystem diversity deals with the variations in ecosystems within a geographical location and its overall impact on human existence and the environment.
This forms an important part of the evidence on which evolutionary theory rests, demonstrates that evolution does occur, and illustrates the processes that created Earth's biodiversity. It supports the modern evolutionary synthesis —the current scientific theory that explains how and why life changes over time.
Species richness, or biodiversity, increases from the poles to the tropics for a wide variety of terrestrial and marine organisms, often referred to as the latitudinal diversity gradient. [1] The latitudinal diversity gradient is one of the most widely recognized patterns in ecology. [1] It has been observed to varying degrees in Earth's past. [2]
It concludes that human activity is having a significant and escalating impact on the biodiversity of the world ecosystems, reducing both their resilience and biocapacity. The report refers to natural systems as humanity's "life-support system", providing essential ecosystem services.
Life forms live in every part of the Earth's biosphere, including soil, hot springs, inside rocks at least 19 km (12 mi) deep underground, and at least 64 km (40 mi) high in the atmosphere. [26] [27] [28] Marine life under many forms has been found in the deepest reaches of the world ocean while much of the deep sea remains to be explored. [29]
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