10 Countries with Highest Total CO₂ emissions in 2019 (Global Carbon Project): Rankġ0 Countries with Highest CO₂ emissions Per Capita in 2019 (Climate Watch Data): Rank Which countries release the highest CO₂ emissions depends upon whether one measures total emissions or emissions per person, also known as per capita. However, as CO₂ is the leading greenhouse gas and the main cause of global warming, making it arguably the most important pollutant in the world, CO₂ emissions are a wise place to start. It can also harm flora and fauna both in the wild, which can damage entire ecosystems, and in agricultural settings, which puts mankind's food supply at risk.īecause pollution takes many different forms, determining which country is the greatest polluter in the world is a complex task (although the most polluted countries are somewhat easier to identify). Pollution can affect humans, causing or exacerbating health problems including allergies, asthma, cancer or heart disease, and even death. Pollution is not a single substance, but thousands of unwanted substances that can be released into the environment through human activity and which then degrade the quality of air, water, soil, or other ecological factors. Pollution and its impact upon the environment is arguably the most important challenge currently facing the world.
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