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The example of fish stocks had led some to call this the "tragedy of the fishers". [18] A major theme running through the essay is the growth of human populations , with the Earth 's finite resources being the general common.
Mass extinctions are characterized by the loss of at least 75% of species within a geologically short period of time (i.e., less than 2 million years). [18] [51] The Holocene extinction is also known as the "sixth extinction", as it is possibly the sixth mass extinction event, after the Ordovician–Silurian extinction events, the Late Devonian extinction, the Permian–Triassic extinction ...
The effects of climate change on plant biodiversity can be predicted by using various models, for example bioclimatic models. [5] [6] Habitats may change due to climate change. This can cause non-native plants and pests to impact native vegetation diversity. [7] Therefore, the native vegetation may become more vulnerable to damage. [8]
The majority are threatened by habitat loss, but activities such as logging of wild timber trees and collection of medicinal plants, or the introduction of non-native invasive species, also play a role. [96] [97] [98] Relatively few plant diversity assessments currently consider climate change, [95] yet it is starting to impact plants as well.
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Out of all the women working in this sector, 10–20% have been found to have tenure to the land they work on. Reasons for this number include economic and legal barriers. For example, women get fewer and smaller loans to acquire land than men. [24] One other factor that plays into women's land rights for agriculture is the cultural norms of ...
A present-day example of the over-hunting of a species can be seen in the oceans as populations of certain whales have been greatly reduced. Large whales like the blue whale, bowhead whale, finback whale, gray whale, sperm whale, and humpback whale are some of the eight whales which are currently still included on the Endangered Species List ...
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