SimilarityRank
ozone 0.753 5037
greenhouse 0.731 5662
global 0.717 2550
depletion 0.700 11015
stratospheric 0.691 25293
cfc 0.666 9251
climatic 0.651 9898
desertification 0.648 27119
stratosphere 0.645 17932
icecap 0.645 88649
dioxide 0.640 4762
co2 0.636 18793
atmospheric 0.635 7829
ipcc 0.628 40905
chlorofluorocarbon 0.618 24061
hcfc 0.617 89263
deforestation 0.616 16781
nox 0.613 28969
pollution 0.611 2289
tropospheric 0.609 67421
antarctic 0.609 9187
biodiversity 0.609 24873
glaciologist 0.604 84899
carbon 0.602 3195
pollutant 0.601 10281