Greenhouse effect keeps global temperatures constant
Solar radiation warms the Earth but some is reflected
CO2 traps heat for a longer time than Methane
Concentration of CO2 is rising due to human activities - Causing environmental concerns
Global warming is changing: temp. rain, seasons and extreme events
Melting of polar ice caps - rising sea levels
Rising sea levels - flooding of low lying land
Spread of tropical diseases due to increased temp.
Age of fossils - radioactive decay of an isotope of carbon
CO2 concentration - air bubbles within ancient ice
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