Reasons and Impacts of climate change

Climate change has occured since 1800s

• True

• False

Answer explanation

Since 1800s, the earth has experienced a significant but irregular upward trend in temperature with fluctuations of 0.3 to 0.6 degree celcius. Over a period of time, you see an upward trend in global mean temperature.

Climate change is mostly attributed to _____________ factors

Answer explanation

Another definition for this word is 'human activities' or 'caused by human activities'

Between 2000 and 2010, _____ square kilometers of forest was lost every year. This means, 142.5 square kilometers of forests are lost every day.

• 52,000

• 53,000

• 54,000

• 55,000

Deforestation leads to enhanced greenhouse effect due to?? Select all the options that apply.

• Forests are unable to absorb carbon dioxide during photosynthesis.

• Soil releases carbon (from the accumulation of decay of organic matter such as dead leaves and animals)

• carbon does not oxidise in the atmosphere to produce carbon dioxide.

Answer explanation

please note that there are 2 ways which carbon dioxide is contributed to the atmosphere.

1. lack of trees to photosynthesise (Take in CO2)

2. soil releases carbon which reacts with oxgen to produce CO2.

So overall, there is more CO2.

Provide a named example of a place in the world where agriculture contributes to enhanced greenhouse effect.

Answer explanation

Locations which are predominantly involved in large-scale agriultural activities would contribute to large amounts of greenhouse gasses. E.g. those involved in rice production (Indonesia, Thailand) cattle farming (Australia, Brazil, Argentina). When such places rely on machineries like tractors, they add on to greenhouse gasses as these machines run on fossil fuels.

Which of these gasses is not an example of greenhouse gas.

• carbon dioxide

• nitrous oxide

• methane

• carbon monoxide

• oxygen

Answer explanation

It is important to know that greenhouse gasses are rsponsible for enhanced greenhouse effect as they trap heat.

In the past, most carbon dioxide emissions in the world were contributed by North and Central America and Europe. In the recent decade, most carbon dioxide emissions are from China and India.

• True

• False

Explain why rapidly developing countries like China and India would contribute more to global carbon dioxide emissions?

With reference to the figure, identify 1 contributor to greenhouse gas emissions and explain how it contributes to enhanced greenhouse effect.

Rising sea level will impact humans negatively. Which of the statements are true?

• over 600 million peopole live in areas less than 10 metres above sea level

• Around 10 to 50 million people living near coastal areas will be at risk of flooding due to rising sea levels

• Those living in Majuro Atoll in the Pacific Ocean will lose 100% of their land if the sea level rises by 0.5 metres.

Answer explanation

please ensure you know the details of these named examples well, including the accurate name of the location and the statistics/data for support.