Human activities which contribute to an increase in greenhouse gases in the atmosphere Flashcards – AQA GCSE Combined Science: Trilogy (8464) — Chemistry — Foundation

What is the overall causal chain linking human activity to global climate change?

Human activity increases atmospheric greenhouse gases, changing Earth's energy balance and likely warming the surface. This warming can alter long-term climate patterns.

Why must evidence about global climate change be judged carefully?

The climate system is extremely complex.

Why do climate models include assumptions and uncertainties?

They simplify reality when representing the climate system.

What three aspects should be checked when evaluating a climate change report?

• The quality and completeness of the evidence
• Whether uncertainties are recognised
• Whether conclusions go beyond what the evidence supports

Why should scientific claims in media reports not be accepted uncritically?

Reports may focus on selected evidence or present biased opinions.

How does peer review help improve the reliability of climate change research?

It allows other scientists to check the methods, data and conclusions.

Why is it important to communicate climate change results clearly to different audiences?

So that the evidence, limitations and uncertainty are properly understood.

Which two human activities release carbon dioxide into the air?

Burning fossil fuels and deforestation.

What are two sources of methane emissions?

Livestock and the decay of organic waste.

How do carbon dioxide and methane reduce the rate at which energy escapes to space?

They absorb some of the infrared radiation emitted by Earth.

What effect do higher concentrations of carbon dioxide and methane have on the greenhouse effect and global temperature?

They strengthen the natural greenhouse effect, raising global temperatures.

What changes in climate patterns can result from the enhanced greenhouse effect?

Changes in temperature and rainfall patterns.