Over the last century, many things have changed in our environment. For instance, the global average temperature has risen by about 1 degree Celsius. This rise has caused significant melting of polar ice caps. Furthermore, humanity has produced an enormous amount of waste, much of which has ended up in landfills or oceans. Since the industrial revolution, carbon dioxide levels in the atmosphere have increased dramatically. As a result, many ecosystems have been stressed, and some animal populations have already decreased significantly. Scientists have been warning us about these issues for decades.
Parçaya göre, atmosferdeki karbondioksit seviyelerinde sanayi devriminden bu yana ne gibi bir değişim olmuştur?
A) They have remained constant.
B) They have decreased slightly.
C) They have increased dramatically.
D) They have been stable.
E) They have caused polar ice caps to melt.