Answer:
The primary cause of global warming is man's burning of fossil fuels (coal, oil and natural gas) in industry, transport and to generate electricity. All these processes release extra carbon dioxide (CO2) which has been hidden away for millions of years. This extra CO2 is disrupting the natural carbon cycle which has kept the planet at a comfortable temperature for as long as life has existed. This extra CO2 is causing the enhanced, or accelerated greenhouse effect in the atmosphere.