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In Uganda , a warming of only 2 ° C would massively cut back the land area that is suitable for coffee ( GRID 2002 ) ( Figure 1 ) . The aim was to clean up the drainage ditches to prevent flooding and ocean surges . He himself was distinguished by a white tunic ; his look was entirely that of a hero of the middle ages , - - his face , still young , for the excitements of his life , though so many , have all been youthful , and there is no fatigue upon his brow or cheek .... The qualitative scenario narrative plays a critical role in giving voice to key aspects such as cultural influences , values , behaviours and institutions , which are not quantifiable . In the case of industrial pollution , end-ofpipe technologies like scrubbers and filters have helped reduce emissions of certain pollutants . A recent study on the effects of global warming on rice yields in the Philippines found that yields declined by ten per cent for each 1 ° C increase in mean daily minimum ( night-time ) temperature in the growing season ( Peng and others 2004 ) .