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Biodiversity is a variety of life as we saw in this video we are four to be eight point seven million species on planet Earth and as we saw in this video biodiversity is of utmost importance to humans. The loss of one key species can have a detrimental impact on many levels from other species of animals to plants to the physical environment as shown by wolfs. Human activities are reducing biodiversity: our future depends upon maintaining a good level of biodiversity and so we need to start taking measures to try and stop the reduction. In this video we're going to look at our humans are negatively impacting biodiversity. Here are some of the main human induced traits facing biodiversity: as the world population has gone from 1.5 billion in 1900 to nearly 7.5 billion people, today unsurprisingly the land use has changed . Habitats have been destroyed in favor of agriculture forestry, fishing, urbanization and manufacturing. Unsurprisingly habitat loss has greatly reduced species richness. Habitat fragmentation has also means that populations have been split into smaller subunits which then when faced by challenging circumstances have not been able to adapt and survive. After habitat loss over-harvesting has had a huge effect on biodiversity. Humans historically exploit plants and animal species for short-term profit. If a resource is profitable we develop more efficient methods of harvesting and inevitably depleting the resource as is currently happening with fishing and logging. The exploited species they need protection, the difficulty is that the demand then outstrips the supply and so the resource value rises. This increases the incentive to extract the resource and leads the final collapse of the population. Has happened with wealth innocent spotted cats called tuna and many more species. Human activities are polluting the toxic discharge in the water from industrial processes unsurprisingly as a negative effect on local aquatic species by killing weakening or affecting their ability to reproduce. Another big water pollution problem is eutrophication, which we look at in detail in this video: phosphorus and nitrogen in fertilizers run of agricultural fields and pass into rivers these surplus nutrients cause algae to bloom which in stoves other aquatic species of oxygen and light causing and dimed. Acid rain is the consequence of humans polluting the air. This causes lakes and water bodies to become more acidic killing fish mollusks, amphibian and many other species . A huge impact of humans on planet Earth is an introduction of alien species to habitats. In fact it is estimated that on any given day there are 3000 species in transit aboard ocean-going vessels. Alien species can cause problems in a number of ways pause the video and have a look throughout the Earth's history. They have been periods of rapid climate change that have led to mass extinction events. We are currently in a period of fluctuating climate but nearly all signs of the tree that humans activities like burning fossil fuels or speeding up global warming we don't know how much climate change is going to affect biodiversity in the future but it is predicted to be huge loss of sea ice and ocean acidification are already causing reduction in biodiversity. Climate change alters temperature and weather patterns with changing patterns of rainfall and drought expected to have significant impacts on biodiversity, so then you have a selection of human impacts on biodiversity. There are many more which was a quick search on the internet will bring up if you want to understand why we should care about maintaining biodiversity watch this video.
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