Causes and effects of climate change
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Causes of Climate Change: Greenhouse Gases, Fossil Fuels, and Deforestation
The main cause of climate change is the increase in greenhouse gases like carbon dioxide (CO₂), methane (CH₄), and nitrous oxide (N₂O) in the atmosphere. These gases trap heat, causing the planet to warm up. Human activities, especially burning fossil fuels such as coal, oil, and natural gas for energy, are the largest contributors to these emissions. Power generation alone is responsible for about 23 billion tons of CO₂ emissions each year, with coal being particularly harmful because it releases much more CO₂ than other fuels for the same amount of energy produced Trenberth2018Ebi2020.
Deforestation is another major cause. Trees absorb CO₂, so when forests are cut down or burned for agriculture or development, not only is this carbon-absorbing capacity lost, but large amounts of CO₂ are also released into the atmosphere Anzualdo2024Reddy2014Trenberth2018+1 MORE. Other human activities, such as industrial processes, urbanization, and agriculture, also contribute to the release of greenhouse gases and environmental pollution Kabir2023Reddy2014Shivanna2022+1 MORE.
Effects of Climate Change: Rising Temperatures, Extreme Weather, and Environmental Impact
Climate change leads to a steady increase in global average temperatures, which has been clearly observed in recent decades. This warming causes glaciers to melt, sea levels to rise, and changes in precipitation patterns, resulting in more frequent and intense droughts, floods, and storms Anzualdo2024Hardy2003Raizada2022+3 MORE. For example, the White Mountain Range has lost about 40.5% of its glacier coverage, and tropical glaciers have decreased by over 28% in recent years .
These changes also affect ecosystems and biodiversity. There is a loss of habitats, shifts in where plants and animals can live, and a decline in crop productivity. The health of freshwater systems, marine environments, and forests is threatened, leading to reduced biodiversity and increased risk of extinction for many species Hardy2003Kabir2023Shivanna2022+1 MORE.
Human and Societal Consequences: Health, Economy, and Inequality
Climate change has direct and indirect effects on human health. It increases the risk of heat-related illnesses, injuries from extreme weather events, and the spread of infectious diseases. Food and water insecurity are also growing concerns as agricultural productivity declines and water sources become less reliable Hardy2003Chukwuemeka2024Musa2024. These health risks are not distributed equally; vulnerable populations and communities with fewer resources are more likely to suffer the worst impacts .
Economically, climate change causes damage to infrastructure, reduces crop yields, and increases the costs of disaster response and recovery. The overall impact is a threat to human welfare and global stability Anzualdo2024Hardy2003Ebi2020.
Conclusion
Climate change is primarily driven by human activities that increase greenhouse gas emissions, especially the burning of fossil fuels and deforestation. Its effects are widespread, including rising temperatures, more extreme weather, loss of biodiversity, and serious risks to human health and the global economy. Addressing climate change requires urgent action to reduce emissions, protect natural resources, and support vulnerable communities Anzualdo2024Hardy2003Kabir2023+7 MORE.
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