Global Warming

What has happened to the average global temperature over the last 2000 years?

• It has remained the same.

• It has only increased in the last 100 years.

• It has decreased.

• It has varied but is now warmer.

How might climate change affect rainfall patterns?

• Rainfall will be evenly distributed.

• Some areas will have more rain, others less.

• Rainfall will stop completely.

• Rainfall will only increase in deserts.

What happens to sea levels when ice in mountain glaciers melts?

• Sea levels decrease.

• Sea levels remain the same.

• Sea levels rise.

• Sea levels fluctuate.

What effect does extra carbon dioxide have on the oceans?

• It makes the oceans less acidic.

• It makes the oceans more acidic.

• It has no effect on the oceans.

• It makes the oceans warmer.

What is a positive feedback loop in the context of global warming?

• A process that has no effect on climate.

• A process that accelerates warming.

• A process that stabilizes temperatures.

• A process that cools the Earth.