irrigation system - an organized supply of water to lands or crops, elaborate (adj.) - complex, intricate, organized in a difficult way, chop down trees - cut down, contaminate - pollute, conversely - in contrast, retain (water) - keep, arboreal /ɑːˈbɔːriəl/ - related to trees, crucial - vital, very important, oppressive (heat) - unpleasantly hot, diminish (lung function) - reduce, attention span - the period of time during which you continue to be interested in something, embrace (the importance of urban trees) - eagerly accept an idea,

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