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The World Scientists' Warning to Humanity in 1992 begins with: "Human beings and the natural world are on a collision course". About 1,700 of the world's leading scientists, including most Nobel Prize laureates in the sciences, signed this warning letter. The letter mentions severe damage to the atmosphere, oceans, ecosystems, soil productivity ...
Contents. Deforestation by continent. In decades since 1990, South America and Africa have shown the greatest loss of forest area, with global net loss in the 2010s still about 60% of the 1990s value. [ 1 ] Rates and causes of deforestation vary from region to region around the world. In 2009, two-thirds of the world's forests were located in ...
The period since 1950 has brought "the most rapid transformation of the human relationship with the natural world in the history of humankind". [21] Almost one-third of the world's forests, and almost two-thirds of its grassland, have been lost to human agriculture—which now occupies almost half the world's habitable land.
A 2019 review of scientific papers found the consensus on the cause of climate change to be at 100%, [6] and a 2021 study concluded that over 99% of scientific papers agree on the human cause of climate change. [7] The small percentage of papers that disagreed with the consensus often contained errors or could not be replicated.
The Arctic has warmed the most, and temperatures on land have generally increased more than sea surface temperatures. Earth's average surface air temperature has increased almost 1.5 °C (about 2.5 °F) since the Industrial Revolution. Natural forces cause some variability, but the 20-year average shows the progressive influence of human activity.
Human extinction is the hypothetical end of the human species, either by population decline due to extraneous natural causes, such as an asteroid impact or large-scale volcanism, or via anthropogenic destruction (self-extinction), for example by sub-replacement fertility. Some of the many possible contributors to anthropogenic hazard are ...
The report systematically considers a country's vulnerability and its exposure to natural hazards to determine a ranking of countries around the world based on their natural disaster risk. The WorldRiskIndex (WRI), developed by the Institute for Environment and Human Security (EHS) of the United Nations University (UNU) and Bündnis Entwicklung ...
[20] In June 2019, one million species of plants and animals were at risk of extinction. At least 571 plant species have been lost since 1750, but likely many more. The main cause of the extinctions is the destruction of natural habitats by human activities, such as cutting down forests and converting land into fields for farming. [21]