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In_II the_AT world_NN1 ,_, there_EX are_VBR now_RT more_RRR and_CC more_RGR extraordinarily_RR large_JJ cities_NN2 which_DDQ constantly_RR cause_VV0 the_AT continuing_JJ shrinkage_NN1 of_IO wildlife_NN1 ,_, including_II vegetation_NN1 ,_, forests_NN2 ,_, animals_NN2 ,_, and_CC a_AT1 balanced_JJ eco-system_NN1 ._. 
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There_EX are_VBR more_DAR than_CSN fifty_MC cities_NN2 with_IW more_DAR than_CSN five_MC million_NNO inhabitants_NN2 and_CC more_DAR than_CSN 200_MC cities_NN2 with_IW one_MC1 or_CC more_DAR million_NNO living_NN1 there_RL ._. 
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The_AT American_JJ novel_NN1 and_CC play_NN1 ,_, "_" A_ZZ1 Tree_NN1 Grows_VVZ in_II Brooklyn_NP1 ,_, "_" indicates_VVZ the_AT importance_NN1 that_CST a_AT1 single_JJ growing_JJ tree_NN1 has_VHZ in_II such_DA a_AT1 large_JJ metropolis_NN1 as_CSA Brooklyn_NP1 ,_, one_MC1 of_IO the_AT five_MC boroughs_NN2 of_IO New_NP1 York_NP1 City_NN1 ,_, especially_RR since_CS very_RG little_DA1 wildlife_NN1 still_RR remained_VVN in_II that_DD1 city_NN1 ._. 
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Fortunately_RR ,_, New_NP1 York_NP1 City_NN1 still_RR does_VDZ have_VHI Central_JJ Park_NN1 ,_, one_MC1 of_IO the_AT largest_JJT urban_JJ parks_NN2 in_II America_NP1 ,_, but_CCB the_AT City_NN1 crowds_NN2 its_APPGE borders_NN2 and_CC prevents_VVZ many_DA2 larger_JJR wild_JJ animals_NN2 from_II thriving_VVG except_CS in_II a_AT1 zoo_NN1 like_II setting_VVG ._. 
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As_CSA cities_NN2 grow_VV0 increasingly_RR outward_RL ,_, all_DB the_AT wildlife_NN1 that_CST previously_RR lived_VVN and_CC grew_VVN in_II the_AT rural_JJ countryside_NN1 now_RT gets_VVZ pushed_VVN farther_RRR away_RL ,_, or_CC eliminated_VVD ,_, or_CC becomes_VVZ constrained_VVN to_II smaller_JJR and_CC smaller_JJR natural_JJ sites_NN2 ._. 
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Many_DA2 endangered_JJ species_NN are_VBR eliminated_VVN ._. 
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Global_JJ warming_NN1 and_CC the_AT depletion_NN1 of_IO the_AT ozone_NN1 layer_NN1 develop_VV0 because_II21 of_II22 all_DB of_IO the_AT air_NN1 ,_, water_NN1 ,_, and_CC environmental_JJ pollution_NN1 which_DDQ occur_VV0 in_II the_AT city_NN1 's_GE daily_JJ life_NN1 ._. 
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What_DDQ can_VM be_VBI done_VDN ?_? 
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Ideally_RR ,_, all_DB big_JJ cities_NN2 would_VM deliberately_RR set_VVI aside_RL large_JJ areas_NN2 that_CST will_VM always_RR remain_VVI natural_JJ preserves_NN2 for_IF trees_NN2 ,_, vegetation_NN1 ,_, and_CC wild_JJ life_NN1 ._. 
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Many_DA2 large_JJ cities_NN2 have_VH0 done_VDN so_RR as_II a_AT1 part_NN1 of_IO their_APPGE city_NN1 planning_NN1 and_CC others_NN2 realize_VV0 that_DD1 human_NN1 and_CC wildlife_NN1 populations_NN2 need_VV0 a_AT1 proper_JJ balance_NN1 in_II their_APPGE cities_NN2 ._. 
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This_DD1 may_VM mean_VVI also_RR limiting_VVG human_JJ usage_NN1 in_II such_DA areas_NN2 ._. 
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Some_DD cities_NN2 have_VH0 developed_VVN roof_NN1 top_NN1 gardens_NN2 and_CC have_VH0 reintroduced_VVN trees_NN2 ,_, vegetation_NN1 ,_, and_CC small_JJ wild_JJ animals_NN2 with_IW sufficient_JJ protection_NN1 to_II these_DD2 roof_NN1 top_NN1 gardens_NN2 or_CC natural_JJ areas_NN2 ._. 
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All_DB of_IO us_PPIO2 must_VM give_VVI serious_JJ attention_NN1 to_II the_AT needs_NN2 to_TO balance_VVI city_NN1 growth_NN1 and_CC development_NN1 and_CC to_II preserving_VVG as_RG much_DA1 wildlife_NN1 in_II the_AT range_NN1 of_IO the_AT cities_NN2 as_CSA possible_JJ ._. 
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