4.14 understand how an increase in greenhouse gases results in an enhanced greenhouse effect and that this may lead to global warming and its consequences

The sun heats up the earth with infra-red waves that it emits, these waves travel from the sun through the earth atmosphere and warm it up. The earth emits its own rays so that it maintains its heat instead of just warming up forever! Many of these rays escape the earth's atmosphere- revealing it of heat- but some are absorbed by certain gasses- Greenhouse gasses- this means the heat is trapped within the earth's atmosphere. On a large scale this heats the earth, which we call global warming, and this can lead to climate change: the expected weather patterns reverse or exaggerate: this is thought to result in natural disaster (drought, floods).