Causes and Effects of Climate Change | National Geographic

Summary

Human activities are driving climate change by increasing the amount of greenhouse gases in the atmosphere. Water vapor, carbon dioxide, methane, nitrous oxide, and chlorofluorocarbons allow sunlight in while trapping some heat, strengthening the greenhouse effect.

Burning fossil fuels has raised atmospheric carbon dioxide by more than a third since the Industrial Revolution. The video says CO₂ levels have not been this high in hundreds of thousands of years.

Effects Described

• Melting ice sheets and glaciers contribute to rising sea levels and coastal flooding.
• Warmer temperatures can intensify storms, floods, and heavy snowfall, and contribute to longer, more frequent droughts.
• Shifting habitats, reduced water supplies, and changing weather make it more difficult to grow crops.
• In cities, warmer conditions can increase smog. Exposure to higher smog levels can contribute to asthma, heart disease, and lung cancer.

Possible Response

Replacing fossil fuels with renewable energy sources, such as solar and wind, could reduce greenhouse gas emissions and help prevent some of the worst impacts.

Researchers and Sources

No individual researchers or cited sources are named in the subtitles. The video is from National Geographic.