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: The '''greenhouse effect''' is essential to keep the [[Earth]] warm enough for [[liquid]] [[water]]. If there were no [[Greenhouse Gas|greenhouse gases]] the [[Earth]] would cool and the [[ocean]] would [[freezing|freeze]].
: If the [[percentage]] of [[Greenhouse Gas|greenhouse gases]] were to get too high the [[Mean Average|average]] [[temperature]] of the [[Earth]] would increase due to the '''greenhouse effect'''.
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/1782946403/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946403&linkCode=as2&tag=nrjc-21&linkId=32a0abb60dff015b15b50e9b1d7b4644 ''Greenhouse effect, page 54, GCSE Combined Science Trilogy; Physics, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/1471851362/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851362&linkCode=as2&tag=nrjc-21&linkId=7d78d70a2044ee9982dae010c94af92a ''Greenhouse effect, pages 109-10, GCSE Combined Science Trilogy 2, Hodder, AQA '']
:[https://www.amazon.co.uk/gp/product/1471851338/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851338&linkCode=as2&tag=nrjc-21&linkId=425855d5890466e47189e1c21b67a1ea ''Greenhouse effect, pages 263-4, 279-80, GCSE Biology, Hodder, AQA '']
:[https://www.amazon.co.uk/gp/product/1782945970/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945970&linkCode=as2&tag=nrjc-21&linkId=a120d24dcc7cc7a58192069a3aafc1d2 ''Greenhouse effect, pages 56, 259, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/0198359373/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359373&linkCode=as2&tag=nrjc-21&linkId=952a73bbb09d222ecc4b50d200679849 ''Greenhouse effect/gases, page 294, GCSE Biology; Third Edition, Oxford University Press, AQA '']