Increase in amount of carbon dioxide in air results in:
Global warming
Increase in amount of carbon dioxide in air results in global warming and greenhouse effect.
Most of the radiations that Earth receives by the Sun is reflected back. Earth gets heated up by these reflected radiations and this heat is trapped by the atmosphere. This phenomenon is called green house effect and due to this heating there is an increase in the average temperature of the Earth's atmosphere. This is called global warming.