Greenhouse effect traps heat in earth's atmosphere. This causes land to dry up and leads to drought. paddy cannot survive in dry soil.
Besides, depletion of ozone layer also affects paddy growth. An increase of UV radiation would affect crops. A number of economically important species of plants, such as rice, depend on cyanobacteria residing on their roots for the retention of nitrogen. Cyanobacteria are sensitive to UV light and they would be affected by its increase.
Reference pics:
www.taa.org.sg
http://www.royalchinahenley.co.uk/furniture/rice_bowl.gif
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