Question

1. if the greenhouse effect did not exist, what would the normal temperature of the earth be? 2. what do you think is meant by global warming? 3. list all the things you can think of that give off greenhouse gases - eg cars.

Explanation:

1. Without the greenhouse - effect, the Earth would be much colder. The natural greenhouse - effect keeps the Earth's average surface temperature around 15°C (59°F). Without it, the average temperature would be closer to - 18°C (0°F).
2. Global warming refers to the long - term increase in Earth's average surface temperature due to an enhanced greenhouse effect caused mainly by human activities that increase the concentration of greenhouse gases in the atmosphere, such as burning fossil fuels (coal, oil, and gas), deforestation, etc.
3. Sources of greenhouse gases include burning of fossil fuels in power plants, vehicles (cars, trucks), industrial processes like cement production, agricultural activities (methane from livestock and rice paddies), and deforestation (releases carbon dioxide).

Answer:

1. The normal temperature of the Earth without the greenhouse effect would be around - 18°C (0°F).
2. Global warming is the long - term increase in Earth's average surface temperature due to an enhanced greenhouse effect mainly from human activities.
3. Power plants, vehicles, industrial processes, agricultural activities, deforestation.