7.3.5: Global warming
Not started yet — this one needs some love.
Global warming: caused by increasing levels of carbon dioxide and methane in the atmosphere.
Levels of carbon dioxide and methane in the atmosphere are increasing, and contribute to global warming.
Biological consequences affect living organisms, populations or habitats.
Scientific consensus about global warming and climate change is based on systematic reviews of thousands of peer reviewed publications.
In complex climate evidence, uncertainty can happen because evidence may be incomplete or affected by many interacting factors.
Common exam mistakes
Do not give only physical consequences such as ice melting; link consequences to organisms, habitats, populations or food production.
Do not use climate change as a vague answer without a biological effect.
Scientific consensus means evidence has been reviewed across many peer-reviewed studies; it is not just one scientist’s opinion.
Uncertain or incomplete evidence does not mean no evidence; it means complex systems can have many interacting factors.