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  2. Climate change - Wikipedia

    en.wikipedia.org/wiki/Climate_change

    Climate change threatens people with increased flooding, extreme heat, increased food and water scarcity, more disease, and economic loss. Human migration and conflict can also be a result. [13] The World Health Organization (WHO) calls climate change the greatest threat to global health in the 21st century.

  3. Causes of climate change - Wikipedia

    en.wikipedia.org/wiki/Causes_of_climate_change

    Future global warming potential for long lived drivers like carbon dioxide emissions is not represented. The scientific community has been investigating the causes of climate change for decades. After thousands of studies, it came to a consensus, where it is "unequivocal that human influence has warmed the atmosphere, ocean and land since pre ...

  4. Effects of climate change - Wikipedia

    en.wikipedia.org/wiki/Effects_of_climate_change

    Some climate change effects: wildfire caused by heat and dryness, bleached coral caused by ocean acidification and heating, environmental migration caused by desertification, and coastal flooding caused by storms and sea level rise. Effects of climate change are well documented and growing for Earth's natural environment and human societies.

  5. Pollution - Wikipedia

    en.wikipedia.org/wiki/Pollution

    Pollution is the introduction of contaminants into the natural environment that cause adverse change. [1] Pollution can take the form of any substance (solid, liquid, or gas) or energy (such as radioactivity, heat, sound, or light). Pollutants, the components of pollution, can be either foreign substances/energies or naturally occurring ...

  6. Plastic pollution - Wikipedia

    en.wikipedia.org/wiki/Plastic_pollution

    Plastic pollution is the accumulation of plastic objects and particles (e.g. plastic bottles, bags and microbeads) in the Earth's environment that adversely affects humans, wildlife and their habitat. [1] [2] Plastics that act as pollutants are categorized by size into micro-, meso-, or macro debris. [3] Plastics are inexpensive and durable ...

  7. Drought - Wikipedia

    en.wikipedia.org/wiki/Drought

    A drought is a period of drier-than-normal conditions. [1] : 1157 A drought can last for days, months or years. Drought often has large impacts on the ecosystems and agriculture of affected regions, and causes harm to the local economy. [2] [3] Annual dry seasons in the tropics significantly increase the chances of a drought developing, with ...

  8. Water pollution - Wikipedia

    en.wikipedia.org/wiki/Water_pollution

    Nitrogen pollution can cause eutrophication, especially in lakes. Eutrophication is an increase in the concentration of chemical nutrients in an ecosystem to an extent that increases the primary productivity of the ecosystem. Subsequent negative environmental effects such as anoxia (oxygen depletion) and severe reductions in water quality may ...

  9. Environmental issues - Wikipedia

    en.wikipedia.org/wiki/Environmental_issues

    Environmental issues are disruptions in the usual function of ecosystems. [1] Further, these issues can be caused by humans ( human impact on the environment) [2] or they can be natural. These issues are considered serious when the ecosystem cannot recover in the present situation, and catastrophic if the ecosystem is projected to certainly ...

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